Disk Cartridge Indicators
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
Sensible holes extending through an optical disk cartridge determine if the cartridge is enclosing a read-only disk, a write-once disk, or an erasable disk. As a result, drive sense bits are generated that can be interrogated by a controller to determine what type of disk is present in the drive. Since different types of media (one-sided, doubled-sided either read-only or write-once or erasable) can be inserted into the same optical drive, a detection method is needed to assure read-only media will not be written to or write-once media will not be rewritten. One method for assuring this is to have holes in the optical disk cartridge which can be sensed by optical or mechanical sensors. This information is then stored in the drive as part of the drive sense-bit definition. The figure is a top view drawing of a cartridge.