Abstract: The present invention implements an ion detector with which it is possible to avoid direct collisions of negative ions with a scintillator, prevent degradation of the scintillator, prolong life of the scintillator, reduce the need for maintenance, and perform highly sensitive detection of both positive and negative ions. With respect to a reference line 65 connecting a central point 63 of a positive ion CD 52 and a central point 64 of a counter electrode 54, a central point 66 of a negative ion CD 53 is provided in a region of a side opposite to a region of a side of a central point 67 of a scintillator 56. Positive ions entering from an ion entrance 62 receive a deflection force and collide with the positive ion CD 52 to generate secondary electrons. The generated secondary electrons collide with the scintillator 56 to generate light. The generated light passes through a light guide 59 and is detected by a photomultiplier tube 58. A negative potential barrier is generated along the reference line 65.

Abstract: A storage apparatus which writes information on a portable storage medium in response to a request from at least one host unit is provided with a writing part for writing on the detachable storage medium, a user password and a master password which limit access to the portable storage medium, and an access control part which permits a modification of the user password by specifying the master password, permits access to a data region on the portable storage medium by specifying the user password which is provided in common with respect to a plurality of users, and prohibits at least one of write and read with respect to each of the plurality of users.

Abstract: A read retry of an MSR medium is executed while changing a setting of a reproducing magnetic field. Parameter set values of a successful read retry are stored as statistic information. When changes of the set values for defaults increase, the defaults are updated. The parameter set information of a retry success is stored as statistic information. In a new read retry, the parameter set information of a high success ratio is selected from the statistic information and the retry is executed.

Abstract: There is provided a data storage device which reads data from and/or writes data to a memory medium, comprising: an acquisition unit for acquiring management information which is recorded by a predetermined form in said memory; and a controller for converting the management information into another form. The controller rearranges the management information to convert the management information into another form, and also the controller restores the converted management information to the predetermined form according to a relationship between a first identifier recorded on the memory medium and a second identifier recorded in the data storage device. When, for example, the two identifiers match, the acquisition unit can acquire the management information, and the reading and writing of data is enabled.

Abstract: It is provided a data storage device which reads data from and/or writes data to a memory medium, comprising: a storage unit for storing a first identifier; an identifier acquisition unit for acquiring a second identifier recorded on a memory medium which is set to said data storage device; and a controller for comparing said first identifier with said second identifier, and controlling to access to said memory medium for data reading and/or writing according to a relationship between said first identifier and said second identifier. For example, when the first identifier does not match the second identifier, the controller inhibits access to the memory medium for the reading and writing of data. But when the first and the second identifiers match, the controller permits access to the memory medium for the reading and writing of data.

Abstract: A data storage device reads data from and/or writes data to a memory medium. The data storage device includes a storage unit for storing a first identifier, an identifier acquisition unit for acquiring a second identifier recorded on a memory medium which is set to the data storage device, and a controller for comparing the first identifier with the second identifier, and then controlling to access to the memory medium for data reading and/or writing according to a relationship between the first identifier and the second identifier. For example, when the first identifier does not match the second identifier, the controller inhibits access to the memory medium for the reading of data. But, when the first and second identifiers match, the controller permits access to the memory medium for the reading and writing of data.

Abstract: It is provided a data storage device which reads data from and/or writes data to a memory medium, comprising: a storage unit for storing a first identifier; an identifier acquisition unit for acquiring a second identifier recorded on a memory medium which is set to said data storage device; and a controller for comparing said first identifier with said second identifier, and controlling to access to said memory medium for data reading and/or writing according to a relationship between said first identifier and said second identifier. For example, when the first identifier does not match the second identifier, the controller inhibits access to the memory medium for the reading and writing of data. But when the first and the second identifiers match, the controller permits access to the memory medium for the reading and writing of data.

Abstract: A storage unit for recording on a portable recording medium identification information which is peculiar to the portable recording medium, includes a number generation part for generating a firmware management number based on a version number of a firmware of the storage unit and a number of times the firmware is installed in past in the storage unit and other storage units, an information generation part for generating the identification information based on at least a medium generation consecutive number which indicates a number of times the identification information is recorded on portable recording mediums and the firmware management number, and a recording part for recording the identification information on the portable recording medium.

Abstract: It is provided a data storage device which reads data from and/or writes data to a memory medium, comprising: an acquisition unit for acquiring management information which is recorded by a predetermined form in said memory; and a controller for converting the management information into an another form. The controller rearranges the management information to convert the management information into another form, and also the controller restores the converted management information to the predetermined form according to a relationship between a first identifier recorded on the memory medium and a second identifier recorded in the data storage device. When, for example, the two identifiers match, the acquisition unit can acquire the management information, and the reading and writing of data is enabled.

Abstract: A storage unit for recording on a portable recording medium identification information which is peculiar to the portable recording medium, includes a number generation part for generating a firmware management number based on a version number of a firmware of the storage unit and a number of times the firmware is installed in past in the storage unit and other storage units, an information generation part for generating the identification information based on at least a medium generation consecutive number which indicates a number of times the identification information is recorded on portable recording mediums and the firmware management number, and a recording part for recording the identification information on the portable recording medium.

Abstract: In a storage device in which data is read ahead and stored in a cache memory during reading of data from a medium, a data buffer is managed so that the probability that data to be read is found in the cache memory will improve. The memory area in the cache memory is divided so that a DIR-associated data buffer area used to store a leading address and file name of each file, a FAT-associated data buffer area used to store an address of each file in the next sector, and a data division-associated data buffer area used to store data can all be defined. Addresses referring to the FAT-associated data buffer area and DIR-associated data buffer area are fixed. As a result, as more and more data is read, more and more valid data corresponding to the data residing in the FAT and DIR in a storage medium is found in the cache memory. Consequently, when data reading is requested, data can be transferred without the necessity of reading the storage medium. This results in a shortened reading time.

Abstract: An optical memory apparatus, in which an ODC section generates an interruption according to an instruction from an upper system, an ODD section provides drive controls over a memory apparatus according to an interruption by the ODC, and an MPU actuates a timer when an interruption by the ODC is successively generated, invalidates the interruption when a measure time from a time point of generation of a previous interruption until a time point of generation of the last interruption is not over a prespecified period of time, and validates, on the other hand, the interruption when the time measured by the timer is over the prespecified period of time.