Abstract: An information process device according to an embodiment includes a thermal head that prints on paper at positions along a width direction based on a reference position. The sensor is at a sensor position in the width direction and detects marks on paper being conveyed by a conveyance unit. The controller controls the conveyance unit to convey a confirmation sheet and then detects a position of a mark on the confirmation sheet with the sensor. The detected position corresponds to the sensor position. The controller next controls the conveyance unit and the thermal head to print a line on a sheet corresponding to the sensor position. The controller is configured to receive a corrected sensor position based on a measured distance of the printed line to an edge of the sheet and update the print reference position accordingly.

Abstract: The subject matter discloses a mobile robot configured to map an area, comprising a body, two or more distance sensors, configured to collect distance measurements between the mobile robot and objects in the area, a rotating mechanism mechanically coupled to the body and to the two or more distance sensors, said rotating mechanism is configured to enable rotational movement of the two or more distance sensors and a processing module electrically coupled to the two or more distance sensors and to the rotating mechanism. The processing module is configured to process the distance measurements collected by the two or more distance sensors and to instruct the rotating mechanism to adjust a velocity of the rotational movement, said velocity is adjusted according to the distance measurements collected by the two or more distance sensors.

Abstract: A radiographic image capturing apparatus includes the following. A connector coupling detector detects coupling between an external connector and a connector of the radiographic image capturing apparatus. A power supply detector detects an available state of external electric power. A controller controls a turned-on and a turned-off state of the radiographic image capturing apparatus. At a timing when the power supply detector detects a change from the available state to the unavailable state of the external electric power, the controller turns off the radiographic image capturing apparatus if the connector coupling detector detects the coupling between the external connector and the connector of the radiographic image capturing apparatus, or the controller maintains the turned-on state if the connector coupling detector detects the uncoupling between the external connector and the connector of the radiographic image capturing apparatus.

Abstract: Aspects of the disclosure pertain to a system and method for providing a flash memory cache input/output throttling mechanism based upon temperature parameters for promoting improved flash life. The mechanism restricts flash memory cache caching of inputs/outputs associated with Least Recently Used data and Most Recently Used data when a temperature of the flash memory is at or above a threshold temperature.

Abstract: When the temperature of a main CPU detected by a temperature sensor exceeds a set temperature, a sub CPU drives a drive unit of an optical disc under the condition where the operation of the main CPU is suspended to stop the rise in temperature caused by the main CPU. In this case, cooling of the main CPU advances by the wind based on the driving of the optical disc, and as a result, the suspension time of data reading from the optical disc or data writing to the optical disc until the main CPU restarts can be shortened.

Abstract: A processing unit performs a method including controlling a reading-out of data from a first storage medium at a predetermined read-out data rate to produce inputted data, and controlling a compression of the inputted data to produce first compressed data of a first compressed format. The method includes controlling a storage of the first compressed data in a second storage medium at a faster writing data rate than the predetermined read-out data rate, controlling a reading-out of second compressed data of a second compressed format from the second storage medium, and controlling a decompression of the second compressed data to produce decompressed data. The method also includes controlling simultaneously the storage of the first compressed data in the second storage medium, the reading-out of the second compressed data from the second storage medium, and audibly reproducing the decompressed data. The first compressed format is different from the second compressed format.

Abstract: A system for determining a cleanliness of a lens of an optical disc drive. The system includes a controller configured to control movement of the lens of the optical disc drive between a first position and a second position relative to the optical disc. The first position is located a first distance from an outer surface of the optical disc and corresponds to a position causing the lens to focus light on a data layer of the optical disc. The second position is located a second distance, different than the first distance, from the outer surface and corresponds to a position causing the lens to focus light on the outer surface. The controller is further configured to receive a measurement of light reflected by the optical disc while the lens is in the second position and determine the cleanliness of the lens based on the measurement of the light.

Abstract: Aspects of the disclosure provide a method. The method includes receiving regional quality information of a region on a storage medium, and adjusting a fill level threshold of a buffer based on the regional quality information. The fill level threshold is used to trigger filling the buffer with data read from the region.

Abstract: A failure prediction system for performing failure prediction to a monitoring target device by detecting a state, comprising: a state detection unit for detecting state signals of no smaller than two different kinds, and outputting a detection signal corresponding to each of the state signals; a phase processing part for synchronizing a plurality of the detection signals; a signal analysis part for calculating a feature value indicating a feature of the state for each of the detection signals from the phase processing part; and a failure prediction part for performing failure prediction of the monitoring target device for each of the feature values by comparing the feature value in question and a reference value set in advance.

Abstract: The present invention optimizes recording power based on correct ? value. Whether an average of modulation values between the 2-4th AUNs is equal to or less than 65% of an average of modulation values between the 5-7th AUNs or not is judged. Otherwise, the gradual emission is performed, the ? value is measured, and then the following requirement is judged: (average of ? values between 5-7th AUNs)?(average of ? values between 2-4th AUNs)?0.18 If each requirement is satisfied, track shift is judged to occur. The recording area of high output is compared with the recording area of lower output to judge whether or not magnitude relation matches the correct magnitude relation. Also, whether the difference between the ? value of high output and the ? value of lower output is equal to or more than the predetermined value (0.18) or not is judged.

Abstract: An optical information device is provided with a first scattering medium (9), a second scattering medium (10), a third scattering medium (11); a diffraction element (4) which generates a plurality of light beams; an objective lens (6) which guides, to the first scattering medium (9) and to the third scattering medium (11) out of the first scattering medium (9), the second scattering medium (10), and the third scattering medium (11), two light beams out of the plurality of the light beams; and an arithmetic circuit (17) which detects a gap interval between the first scattering medium (9) and the third scattering medium (11), and an information medium (12), based on a change in an amount of reflected light from the first scattering medium (9) and from the third scattering medium (11).

Abstract: A magnetic media tester comprising a Laser Doppler Vibrometer (LDV) head; and a magnetic read head; the LDV head and the magnetic read head being configured for obtaining correlatable data of a region on a magnetic disk.

Abstract: Reproduction of digital data using a fallback mechanism is disclosed. The digital data can be reproduced in a first mode and in an at least second mode, the operability of a selected mode is monitored and in a situation of failure, a switching between the mode in which a failure is detected to a mode which is operable can be made, so that least some functionality is ensured. An apparatus is disclosed, the apparatus being operable in a first mode where the digital data is accessed in a first format, and the apparatus being operable in an at least second mode where the digital data is accessed in at least a second format. Also a system, a method, a computer readable code and a data stream are disclosed.

Abstract: Apparatus having corresponding methods comprise: a light source configured to produce light; a lens configured to focus the light on an optical disc; a photo detector configured to obtain a measurement of the light reflected by the optical disc; and a controller configured to determine a cleanliness of the lens based on the measurement of the light reflected by the optical disc responsive to the lens focusing the light on a surface of the optical disc.

Abstract: An optical information processing method and apparatus performs a light irradiating and receiving step, a signal processing step, and an adjusting step of a spherical aberration and a focus offset on the basis of shift amount of first and second control devices and a performance evaluation value. The performance evaluation values for first, second, third and fourth points in an x and y coordinate system are detected, in which an x-coordinate is one of the shift amount of the first control device and the shift amount of the second control device and a y-coordinate is the other, the first point, second and third points having the same y-coordinate and different x-coordinates with each other, the fourth point being provided on a first straight line passing through the first point and being different from the first point.

Abstract: An optical information device is provided with a first scattering medium (9), a second scattering medium (10), a third scattering medium (11); a diffraction element (4) which generates a plurality of light beams; an objective lens (6) which guides, to the first scattering medium (9) and to the third scattering medium (11) out of the first scattering medium (9), the second scattering medium (10), and the third scattering medium (11), two light beams out of the plurality of the light beams; and an arithmetic circuit (17) which detects a gap interval between the first scattering medium (9) and the third scattering medium (11), and an information medium (12), based on a change in an amount of reflected light from the first scattering medium (9) and from the third scattering medium (11).

Abstract: A disk drive configured to enable media defect margining during disk testing may comprise a disk comprising a plurality of tracks; a head actuated over the disk; and a processor operable to test media of the disk drive to detect a media defect; estimate a depth of the detected media defect; determine a margining amount based on at least the estimated depth of the detected media defect, and apply the determined margining amount to the detected media defect.

Abstract: An information recording device in accordance with the present invention obtains drive information of a semiconductor laser which is included in a magnetic head by means of a drive information obtaining section and successively records the information in a drive information storing section. A magnetic head control section controls the magnetic head in accordance with a condition of the semiconductor laser on the basis of the drive information thus obtained by the drive information obtaining section.

Abstract: Aspects of the disclosure provide a method. The method includes receiving regional quality information of a region on a storage medium, and adjusting a fill level threshold of a buffer based on the regional quality information. The fill level threshold is used to trigger filling the buffer with data read from the region.

Abstract: A method of designating a disk recording capacity and an optical disk recording apparatus using the method, where a maximum recording capacity is designated by measuring an external disturbance for disk regions. The method of designating a disk recording capacity includes: partitioning a disk into a plurality of disk regions, and measuring external disturbance at the disk regions; setting a disk speed based on the measured external disturbance, and designating disk regions excluding the disk regions where the external disturbance is measured as recordable disk regions; and calculating a maximum disk recording capacity based on the designated recordable disk regions.

Abstract: When power is supplied to an ODD used by being externally attached to a PC via a USB port, it is desirable not to cause an error to occur owing to occurrence of a power-on reset even when the power supplying ability of the PC is insufficient. After the ODD has been connected with the PC and started, the ODD executes an operation of large current consumption for a predetermined period of time and judges whether a power-on reset occurs or not while the operation is being executed. When the power-on reset does not occur, the ODD is set to operate on the basis of the highest specification. When the power-on reset has occurred, the specification is set lower so as to operate the ODD with reduced current consumption.

Abstract: An instantaneous jitter information detection section detects, based on first and second digital values indicating different polarities relative to a predetermined reference value, an instantaneous gradient value corresponding to a difference value between the first and second digital values, and an instantaneous deviation value corresponding to a difference value between an intermediate value between the first and second digital values and the reference value. An information conversion section converts, based on an inversely proportional conversion table, the instantaneous gradient value to an inversely proportional value. An arithmetic section detects an instantaneous variance value by multiplying the instantaneous deviation value and the inversely proportional value together, and squaring a value obtained by the multiplication, and detects an integrated value by accumulating the instantaneous variance value.

Abstract: In an optical disk library device using a plurality of optical disk devices, before optical disk devices execute recording or reproduction of information to or from optical disks, self-monitoring information is acquired from an optical disk monitor, use preferential orders of the optical disk devices are evaluated on the basis of use frequency information or deterioration information included in the self-monitoring information and an optical disk device to be used for recording or reproduction of information is selected on the basis of the use preferential orders.

Abstract: If a defective cluster in a spare area is managed with a defect entry, the size of a DFL will increase as the size of the spare area increases with an increase in the number of recording layers stacked in a disc. An information recording medium according to the present invention has pointer information indicating the location of the next available cluster in each spare area, and restricts the direction in which the spare area is used. Also, a defect entry indicating a defective cluster in the spare area is registered with the DFL. Thus, even if the size of the spare area 15 increases, the size of the DFL 21 can be kept relatively small. Furthermore, even after physical reformatting is done, a defective cluster, if any, in the spare area 15 can still be recognized as a defect and the control operation can be performed so that a replacement cluster is not re-allocated to that defective cluster (i.e., the defective cluster is not used).

Abstract: If a defective cluster in a spare area is managed with a defect entry, the size of a DFL will increase as the size of the spare area increases with an increase in the number of recording layers stacked in a disc. An information recording medium according to the present invention has pointer information indicating the location of the next available cluster in each spare area, and restricts the direction in which the spare area is used. Also, a defect entry indicating a defective cluster in the spare area is registered with the DFL. Thus, even if the size of the spare area 15 increases, the size of the DFL 21 can be kept relatively small. Furthermore, even after physical reformatting is done, a defective cluster, if any, in the spare area 15 can still be recognized as a defect and the control operation can be performed so that a replacement cluster is not re-allocated to that defective cluster (i.e., the defective cluster is not used).

Abstract: A method for determining an optimal combination of focus bias and spherical aberration compensating value (SA value) in an optical disc drive is provided. Firstly, a first focus bias is set, the SA values are adjusted and the corresponding tracking error signal values are measured. Second-order-approximation is performed to obtain a first maximum value of tracking error signal. Secondly, a second focus bias is set, the SA values are adjusted and the corresponding tracking error signal values are measured. Second-order-approximation is performed to obtain a second maximum value of tracking error signal. Thirdly, a third focus bias is set, the SA values are adjusted and the corresponding tracking error signal values are measured. Second-order-approximation is performed to obtain a third maximum value of the tracking error signal. The three maximum values are compared to obtain the optimal combination of focus bias and SA compensating value in the optical disc drive.

Abstract: A processing unit performs a method including controlling a reading-out of data from a first storage medium at a predetermined read-out data rate to produce inputted data, and controlling a compression of the inputted data to produce first compressed data of a first compressed format. The method includes controlling a storage of the first compressed data in a second storage medium at a faster writing data rate than the predetermined read-out data rate, controlling a reading-out of second compressed data of a second compressed format from the second storage medium, and controlling a decompression of the second compressed data to produce decompressed data. The method also includes controlling simultaneously the storage of the first compressed data in the second storage medium, the reading-out of the second compressed data from the second storage medium, and audibly reproducing the decompressed data. The first compressed format is different from the second compressed format.

Abstract: An offset corrector of an information readout apparatus receives a digital signal DRF output from an A/D converter, and performs offset correction. The offset corrector is capable of switching between a level-correction operation that corrects the offset so that the DC level of the shortest period signal included in the readout signal assumes a zero amplitude reference and a HPF operation that matches the level of the readout signal with the zero amplitude reference. The offset corrector corrects the offset in the level correction operation during a normal reproduction, and switches to the HPF operation for offset correction when a defect judgment unit detects a defective area. The information readout apparatus is stable and has a superior performance without a symmetry deviation if there occurs a waveform fluctuation caused by a defect etc.

Abstract: An optical reading system is provided to improve read signal quality with increasing its linear recording density. An optical recording medium in which the distance from a light incident surface to an information recording layer is less than 100 ?m is irradiated with a laser beam through an objective lens and information stored in the information recording layer is read by means of a PRML detection method. At this time, the constraint length n in the PRML detection method is set to an integer which satisfies 0.5×(?/NA)/(LV/f)?1<n<0.5×(?/NA)/(LV/f)+1, wherein ? represents the wavelength of the laser beam, NA represents the numerical aperture of the objective lens, LV represents the linear velocity of the optical recording medium when recording, and f represents a channel bit frequency when recording.

Abstract: An optical pickup, an optical disk drive device, an optical information recording device, and an optical information reproduction device in which a reproduction signal, a focus error signal, and a gap error signal can be detected with high accuracy when information is recorded/reproduced on/from an optical information medium having a plurality of information recording layers. The optical pickup includes a focusing lens group (7) that includes a solid immersion lens (8) and focuses the light; a first detection lens (11) that focuses the reflected light from an optical information medium (9) on a first detector (12), and a second detection lens (13) that focuses the reflected light from the flat surface portion of the solid immersion lens (8) on a second detector (14).

Abstract: Detecting a defect on a storage device is disclosed. Detecting includes receiving a signal read from a storage device, sampling the signal to obtain a set of signal samples, wherein the sampling starts at an arbitrary time, computing a defect value for a defect type using the set of signal samples, comparing the defect value with a threshold associated with the defect type, determining whether there is a defect of the defect type based at least in part on the comparison, and in the event that a defect is detected, outputting an indication associated with the defect.

Abstract: An optical disk reproducing device for controlling false detection of synchronization signals due to intersymbol interference, and stably improving accuracy of frequency acquisition of a phase locked loop (PLL) even when offset and so on occur. A signal width close to an original mark length is obtained to use for frequency acquisition of the PLL by, for example, using two different slice thresholds and taking a width between a rising of a result of slicing at one threshold and a falling of a result of slicing at the other threshold as a synchronization signal width. When asymmetric properties due to offset, asymmetry, etc. occur, an amount of corrections on the slice threshold is calculated, and it is reflected on a threshold previously set to always obtain a correct synchronization signal width.

Abstract: An optical system for optical pickup, which optical system is used for performing recording, reproducing, and/or erasing of information on an optical recording medium and has a simple configuration, is provided. An optical pickup device 1 includes a collimator lens system 23, a beam expander 33, and an objective lens system 34 that includes an S-SIL element 27b. The beam expander 33 includes a lens element 33c that is supported so as to be movable in a direction perpendicular to an optical axis. By moving the lens element 33c in the direction perpendicular to the optical axis, a coma aberration of a spot on a recording layer can be compensated in a state where the interval between a surface of an optical recording medium 28 and the S-SIL element 27b opposed thereto is maintained constant.

Abstract: An apparatus for optically checking magnetic disk defects that makes possible more accurate determination of positions of minute defects by illuminating an area greater than a checkup area with an illuminating beam having a Gaussian distribution is to be provided. The apparatus is configured of a specular reflection detecting device including a detector having a detecting face including an array of multiple pixels, and a processing device that figures out the position of each defect by using, in addition to the output signal from each of the pixels of the detector that detected a specular reflection from the checkup area, also output signals of some pixels out of the multiple pixels having detected the specular reflection from the checkup area of one turn before and the checkup area of one turn after, both adjoining in the radial direction, and determines the type of the defect.

Abstract: A method of controlling a head for a recording medium includes determining that the head is in an inoperative state, and activating a damping arrangement in response to the determination that the head is inoperative. A movement of the head while the head is inoperative is sensed. The damping arrangement is used in response to the sensing step to exert a force upon the head to thereby damp the movement, a magnitude of the force being dependent upon a parameter of the movement.

Abstract: Techniques are provided for controlling the reading of optical data from a master disk in a holographic replication system. Imperfections in the master disk or movement of the disk during a recording process may cause source beams to deviate from target data tracks. In some embodiments, a detector system is used to determine the focus and alignment of the source beams on the master disk, as well as the tilt and rotation of the disk with respect to the holographic replication system. The detector system may detect deviations in the intensity distribution of the reflections of the source beams and generate an error signal corresponding to focusing, tracking, tilt, and/or rotational errors. Servo-mechanical devices may actuate optical components to compensate for such errors.

Abstract: A method for detecting whether vertical deviation of an optical disc occurs is provided. First, before a pickup head is successfully focused on the optical disc, a pickup head is actuated based on an input control signal so as to generate a focus error signal with a plurality of S-curves. Then, a plurality of zero crossing points of the S-curves in the focus error signal is identified and a plurality of input control values respectively corresponding to the zero crossing points is obtained. A variation of the input control values is then calculated. Whether vertical deviation of the optical disc occurs can be determined according to the variation of the input control values.

Abstract: An optical disk apparatus according to the present invention includes: a drive selector 28 that makes a switch between a setting for sending a drive signal generated by a focus drive generation section 25 to a focus drive section 29, and a setting for sending a drive signal generated by a focus filter 27 to the focus drive section 29; and a lock-in timing detection section 21 that, upon a light amount signal detected by a light amount signal detection section exceeding a predetermined light amount level, determines that an optical spot reaches a vicinity of any of recording layers, and sends to the drive selector 28 a focus lock-in timing instruction for switching to the setting for sending the drive signal generated by the focus filter 27 to the focus drive section 29. Such configuration provides an optical disk apparatus allowing a stable focus lock in operation to be performed without using a layer determination signal when locking a focus into a recording layer of an optical disk.

Abstract: Various embodiments of the present invention provide systems, methods and media formats for processing user data derived from a storage medium. As an example, a system is described that includes a storage medium with a series of data. The series of data includes a servo data and a user data region. The user data region includes a first synchronization pattern and a second synchronization pattern located a distance from the first synchronization pattern. A storage buffer is provided that is operable to receive at least a portion of the series of data. A retiming circuit calculates an initial phase offset and frequency offset for a defined bit within the storage buffer using a first location of the first synchronization pattern and a second location of the second synchronization pattern. An error correction loop circuit re-samples the series of data from the storage buffer based at least in part on the initial phase offset and a frequency offset.

Abstract: An optical defect detection method for patterned media includes: irradiating a laser beam onto a patterned medium and obtaining reflected light by reflection very close to a sample; outputting the reflected light as an analog electrical signal from an optical receiver; converting the analog signal to a digital signal; obtaining a surface profile in a track direction by sampling the analog signal; obtaining a servo area profile by setting a slice for detecting servo area; calculating an average value in a track width direction based on plural servo area profiles; generating a master servo area profile based on the average value; obtaining a difference between the master servo area profile and the specific servo area profile; and detecting the presence of a defect including surface roughness, process fluctuation, and adhesion of foreign matters, from a differential waveform.

Abstract: A temperature sensor is disposed in an optical pickup to detect a temperature of an objective lens. An optical element (for example, a collimator lens) is driven according to a temperature change of the objective lens, which corrects deterioration of an optical characteristic of a laser beam passing through the objective lens. Good recording/reproduction is smoothly performed even if the optical characteristic of the objective lens is changed with the temperature change.

Abstract: A disc inspecting method includes: forming recording marks on a disc; scanning the recording marks from inside to outside or from outside to inside of the disc by a pickup unit to read a reproduction signal while rotating a spindle to move a slider by each predetermined width; acquiring reproduction data from the reproduction signal in a signal acquiring unit; and determining whether or not the reproduction data is proper in a calculation unit, and optimizing a formation condition of the recording marks when it is determined that the reproduction data is not proper.

Abstract: A circuit for detecting battery cell abnormalities in a multi-cell series battery for effectively and quickly detecting abnormalities with a simple, small circuit that provides improved reliability, safety and service life of the multi-cell series battery. In the voltage monitoring device 12, immediately after the start of the monitoring cycle of any battery cell BTi, cell voltage abnormality detector 14 checks whether cell voltage Vi is outside of the normal operating range. The cell voltage abnormality detector 14 has: a group of selection switches 18 for selecting any battery cell BT of multi-cell series battery 10 and retrieving its voltage to first and second monitoring terminals A, B; cell voltage/monitoring current converter 20; monitoring current/monitoring voltage converter 22; comparison/evaluation circuit 24; evaluation signal output circuit 26 and abnormality detection controller 28.

Abstract: A method and apparatus for recording data on a write-once recording medium are disclosed. In the write-once recording medium, the method includes, when a defect area is detected in the recording medium, deciding a replacement recording method for replacing the defect area, when the detected defect area is replacement recorded in a spare area, recording a position information of the defect area and a position information of the spare area in a temporary management area as a defect management information, and when the detected defect area is skipped and the data is replacement recorded in a next consecutive area, an information indicating that the skipped area is the defect area is recorded in a temporary management area as a defect management information. Thus, the write-once recording medium may be managed with more efficiency and data may be efficiently recorded on the recording medium.

Abstract: Compatibility information embedded in an optical medium modifies actions allowed by predetermined non-compatible optical disc drives on the optical medium, such as optical disc drives that may suffer damage if certain actions are performed on the optical medium. For instance, a compatibility engine of the optical disc drive applies compatibility information read from an optical medium to determine restrictions to impose on the use of the optical medium, such as restricting the optical disc drive from writing to the optical medium, reading from the optical medium or performing any operations until an update to the optical disc drive firmware is performed either automatically or by display of a compatibility user interface at an information handling system associated with the optical disc drive. In one embodiment, the compatibility information identifies incompatible optical disc drives and firmware versions by unique identifiers.

Abstract: Embodiments of methods and systems for controlling access to information stored on memory or data storage devices are disclosed. In various embodiments, methods of retrieving information from a data storage device previously deactivated by modification or degradation of at least a portion of the data storage device are disclosed.

Abstract: In a method for recording information on an information recording medium having a data recording area for storing user data and a test area used for test recording by a recording apparatus, it is detected whether the test area is unusable when executing the test recording. The test recording is executed in the test area when the test area is detected not to be unusable, or executed in the data recording area when detected to be unusable. Management information relating to the test recording executed in the data recording area is recorded in a predetermined area. Hence, it is possible to eliminate a limit of number of times of test recording which depends on the size of the test recording area.

Abstract: A spherical aberration compensation method is provided. A first thickness of a cover layer at a first radius position of an optical disc is measured. A second thickness of the cover layer at a second radius position of the optical disc is measured. A spherical aberration calibration is performed at a third radius position of the optical disc to obtain an optimal spherical aberration compensation value. According to the first and second radius positions, the first and second thicknesses, and the optimal spherical aberration compensation value at the third radius position, a spherical aberration compensation formula is acquired. Afterwards, an updated spherical aberration compensation value is calculated by the spherical aberration compensation formula according to a fourth radius position where an optical pickup head of the optical disc drive is located. The updated spherical aberration compensation value is inputted into a spherical aberration compensator of the optical disc drive.

Abstract: With an object of executing excellent finishing processing when information is recorded to a rewritable type record medium or a write once type record medium, the finishing processing is switched by whether a kind of a medium for recording information is the rewritable type record medium or the write once type record medium and a method of executing the finishing processing is switched based on a state of supplying power.

Abstract: Detecting a defect on a storage device is disclosed. Detecting includes receiving a signal read from a storage device, sampling the signal to obtain a set of signal samples, wherein the sampling starts at an arbitrary time, computing a defect value for a defect type using the set of signal samples, comparing the defect value with a threshold associated with the defect type, determining whether there is a defect of the defect type based at least in part on the comparison, and in the event that a defect is detected, outputting an indication associated with the defect.