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Currently, high-capacity tape drives are usually programmed to display a cleaner cartridge message after a predetermined number of full-reel passes.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
89% of the total text.
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Adaptive Cleaner-Cartridge Message
Currently, high-capacity tape drives are usually programmed to display a
cleaner cartridge message after a predetermined number of full-reel passes.
A better method of employing the cleaner cartridge is based on actual drive
needs. For example, when the number of temporary read/write errors have
reached a threshold number, then a "clean- the drive" diagnostic message could
be displayed on the message display. An interlock (via microcode) might even
prevent further use of the drive until the cleaning operation is accomplished.
This adaptive method of triggering cleaning from the number of read/write
errors provides a better means of determining when cleaning is actually needed.
Fig. 1 shows a schematic for practicing the method.
Alternately, the drive could trigger a "clean-me" message display without
need of the control-unit tracking the read/write errors. This would be by the drive
measuring raw head read amplitude, before the read signal went thru the read
card's automatic gain control. If the RMS read signal fell below a certain
threshold during a read-after-write or during a read operation, then the drive
could invoke the cleaner cartridge message on the drive's message display. The
trigger circuit would be a simple voltage-comparator for each read-track sampled.
All 18 tracks of the head (or a subset such as the middle and outer tracks) could
be sampled and the message display invoked whenever any 1 track, or