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- AT User Diagnostics Revision History
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- Written: First pass, March 1989 by Western Digital Corp.
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- Purpose: Allow quick, easy and thorough AT hard disk controller
- and hard disk diagnostics.
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- Compatability : All Western Digital AT register compatible
- controllers.
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- Program Name : EASYDIAG.EXE (previous versions USERDIAG.EXE)
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- 1) REPORTS CORRECTABLE DATA ERRORS ... Previous versions
- relied on a test of the STATUS register ONLY. USERDIAG
- also has this limitation. If a correctable data error
- is encountered, the test terminates and waits for
- operator input.
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- 2) COMPLETE DOCUMENTATION ............ Details both the
- (U)ser selected advanced test and the (A)utomatic
- quick test. Error messages are verbosely explained in the
- (A)utomatic quick test section of the document.
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- 3) COMMAND TIMEOUTS .................. Have been extended
- to almost a minute on a 12Mhz AT (WDM20). This will
- allow for 33Mhz 80386's with cache and controllers that
- issue SLOW recals.
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- 4) ID FIELD RETRIES DISABLED AT ALL TIMES.
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- 5) STRAIGHT-LINE DRQ SERVICE .......... READ DRQ loop does not
- store data (Write/Read Verify loop does, but more efficiently)
- Complete test consisting of a re(Z)ero, 256 RANDOM seeks,
- 256 RANDOM two-sector reads, and 50 RANDOM data pattern
- (W)rite / Read Verifies of last track takes approximately
- 30 sec. (CDC WREN II, 10 Mhz AT)
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- 6) BAD BLOCK ERRORS IGNORED .......... These errors are
- reported to screen, but testing continues. This is the
- ONLY error that is tolerated in the (A)utomatic or
- (U)ser defined test menus.
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- IMPROVEMENTS OF EZDIAG.EXE OVER USERDIAG.EXE
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- EZDIAG USERDIAG
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- Automatic Quick Test N/A
- Dual test menu ... AUTO + SPECIFIC Specific (A)ll Test
- Bad Block Errors allowed Terminates test
- Retries Disabled Retries enabled
- ECC Correctable Errors reported NOT REPORTED
- Straight-line DRQ service loop Iterative loop
- Exit to DOS from DIAG menu N/A
- Default sector count = 1 Default = 256
- Congratulatory message "command successful"
- Single keystroke test selection Return required
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- Please forward any questions or suggestions to the SYSOP of
- this BBS.
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- Regards,
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- Mel Butler
- WDC Dallas
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