A data storage cartridge for a data storage disk drive has a latent illuminance marker. A light source illuminates the marker and the marker emits illuminance as phosphorescence. A photosensor detects the emitted illuminance, and the decay time is determined. The decay time is checked to provide identification of different types or generations of data storage cartridges.

 
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< Test apparatus for testing a digital storage device

< Variable zone layout and track pitch parameter considerations for information storage disk drive

> Disk drive with calibration bursts that are recorded on a spiral and method of recording the same

> Inertial latch mechanism for restraining components in a disk drive
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