Abstract: In an example, a printing device may include a cartridge including a print substance, a belt, and a controller including a processing resource and a memory resource. The processing resource may execute instructions to deposit a plurality of patches of the print substance from the cartridge onto the belt to determine a cartridge density based on a density of a sub-set of patches of the plurality of patches; and adjust a print substance output of the cartridge based on the determined density of the print substance in the cartridge.

Abstract: Example implementations relate to toner particle storage. An example toner storage device includes a toner particle hopper and a heating device coupled to the hopper to heat toner particles received at the toner particle hopper to compress the toner particles.

Abstract: Aspects of the present disclosure relate to color printing calibration. In a particular example, an apparatus includes a media sensor and a formatter. The media sensor may collect spectral data from light reflected off a print material. The media sensor may include a light source to illuminate a portion of the print material, a diffractor to diffract light reflected off of the print material, and a photo-detector to obtain the spectral data from the light reflected off the print material. The formatter may identify a white-point of the print material using the spectral data and configure color concentrations in the apparatus based on the identified white-point of the print material.

Abstract: In an example, a printing device may include a cartridge including a print substance, a belt, and a controller including a processing resource and a memory resource. The processing resource may execute instructions to deposit a plurality of patches of the print substance from the cartridge onto the belt to determine a cartridge density based on a density of a sub-set of patches of the plurality of patches; and adjust a print substance output of the cartridge based on the determined density of the print substance in the cartridge.

Abstract: According to examples, an apparatus may include a control panel and a control panel processor, which may detect a user input on the control panel while the apparatus is in a low-power state and may determine whether the detected user input corresponds to a user intent for a working component of the apparatus to be implemented. Based on a determination that the detected user input corresponds to a user intent for the working component to be implemented, the control panel processor may output a first signal to a device engine that causes the device engine to start up the working component. In addition, based on a determination that the detected user input does not correspond to a user intent for the working component to be implemented, the control panel processor may output a second signal that does not cause the device engine to start up the working component.

Abstract: A tension feedback signal is generated to reduce tension variation on a tape occurring at a reel frequency. Tension variation information may be obtained and used to generate the tension feedback signal. The tension feedback signal may be combined with a constant tension preset signal. The combined signal may be used to drive a tape reel at a tape reel speed adjusted according to the combined signal.

Abstract: In an example implementation according to aspects of the present disclosure, a method may include capturing an image from a mat or from an object physically disposed on the mat, and comparing the captured image to an image projected by a projector assembly onto the mat or onto the object. The method further includes subtracting the image projected by the projector assembly from the captured image to generate a remainder image assigned as input provided by a user.

Abstract: An output is generated in response to an indication associated with movement of a moveable part in a storage device. The output is for reducing a noise component associated with the movement of the moveable part.

Abstract: A technique includes reading or writing at least one unit of data to or from a sequential access storage medium, which has a physical dimension that is subject to expansion and contraction; and reading or writing a value that indicates the physical dimension.

Abstract: A tension feedback signal is generated to reduce tension variation on a tape occurring at a reel frequency. Tension variation information may be obtained and used to generate the tension feedback signal. The tension feedback signal may be combined with a constant tension preset signal. The combined signal may be used to drive a tape reel at a tape reel speed adjusted according to the combined signal.

Abstract: The present disclosure provides techniques for operating a tape drive. A method of operating a tape drive includes monitoring a parameter of the tape drive during a data access operation. The method also includes detecting an access failure. The method further includes selecting a treatment based on the parameter, applying the treatment, and performing a retry.

Abstract: A tape drive is disclosed. The tape drive determines a current tape width and writes data to the tape as well as the current tape width. The tape width written to the tape is associated with the data. When reading data from a tape the tape drive reads the stored tape width and adjusts the current tape width to match the stored tape width before reading the data associated with the stored tape width.

Abstract: Servo pattern read-back signal processing for storage devices is described. In an example, a method of processing a read-back signal derived from a servo pattern on a storage medium in a storage device includes differentiating the read-back signal in an analog domain to produce a differentiated signal; and converting the differentiated signal into digital samples.

Abstract: Controlling positions of storage media heads is disclosed. An example storage media head position controller includes a position error filter to filter a media head position error based on a target position for a storage media head relative to a storage medium and a present media head position to generate a position signal, and a media speed monitor to modify an integration factor in the position error filter based on a media speed to adjust a phase margin of the position control loop.

Abstract: A tape drive is disclosed. The tape drive determines a current tape width and adjusts the length of a tape head to more closely match the current tape width. The tape drive adjusts the length of the tape head by controlling the power to a heating element coupled to the tape head.

Abstract: The present disclosure provides techniques for operating a tape drive. A method of operating a tape drive includes monitoring a parameter of the tape drive during a data access operation. The method also includes detecting an access failure. The method further includes selecting a treatment based on the parameter, applying the treatment, and performing a retry.

Abstract: Servo pattern read-back signal processing for storage devices is described. In an example, a method of processing a read-back signal derived from a servo pattern on a storage medium in a storage device includes differentiating the read-back signal in an analog domain to produce a differentiated signal; and converting the differentiated signal into digital samples.

Abstract: A tape drive is disclosed. The tape drive determines a current tape width and writes data to the tape as well as the current tape width. The tape width written to the tape is associated with the data. When reading data from a tape the tape drive reads the stored tape width and adjusts the current tape width to match the stored tape width before reading the data associated with the stored tape width.

Abstract: A tape drive is disclosed. The tape drive determines a current tape width and adjusts the length of a tape head to more closely match the current tape width. The tape drive adjusts the length of the tape head by controlling the power to a heating element coupled to the tape head.

Abstract: A system and method for positioning a sensor relative to a storage medium. A system includes a first sensor and a second sensor arranged so that a point of a storage medium traverses each sensor at a different time. A processor is coupled to the sensors. The processor varies the timing of a sample representing a noise signal received from the sensors in accordance with medium velocity. The processor adjusts the position of the sensors based on the sample.