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Stress Verification of a Program Disk

IP.com Disclosure Number: IPCOM000062279D
Original Publication Date: 1986-Nov-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Buhler, OR Overby, WA [+details]

Abstract

After a 5»-inch diskette is written with a program's data image, the disk's program is read back under stress conditions. If the disk passes this stress test, user compatibility is ensured. After a program is written on a disk, the disk is read back under a stressed read condition. A stress read condition, as the name implies, places the diskette drive's read circuits into a more vigorous testing environment. This stress read condition increases the susceptibility to bit shift errors. This verification process not only performs a cyclic redundancy check (CRC) of the previously written data, but also performs the verification of data using a stress read condition. Generally, stress read is accomplished by a modification to the VFO or data recovery circuitry.