Browse Prior Art Database

Adaptive Cleaner-Cartridge Message

IP.com Disclosure Number: IPCOM000040981D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Winarski, D: AUTHOR

Abstract

Currently, high-capacity tape drives are usually programmed to display a cleaner cartridge message after a predetermined number of full-reel passes.

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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 combination of...