Method:
This test has several capabilities which may be used individually or in combination (listed in order of precedence):
reset_asp_logs- Removes all previously saved TA information from the drive. A new TA list with no defects will be created and saved to the ETF. TAs in the dbi_log will be reverted back to type 1 defects (TAs are type 3 defects).
Burnish - Burnish operations are performed as a separate test call on the current asperity log. If burnish is enabled, it will be performed on each asperity in the dbi log. Burnish will be performed for amount of time specified by the "Brnsh" parm.
Stress Mode - Controls the type of burnish to be performed. Stress mode isn't primarily intended to burnish TAs.
Apply Specs - Apply all test specifications (except "scratch") for pass/fail. (e.g. Max. Asperity count per HDA)
Enable Logging - Enables Writing Asperity records to the ETF log cylinder as they are found during testing.
Fail Safe - Disables return of all failure codes.
IMPORTANT NOTES ON OPERATION:
The Flag byte of the Asperity record has 2 bits that are used.
1. Bit 7 is used as the "Reject" or failure flag, indicating that this asperity was detected during an "Apply test specs" scan.
NOTE: During the reject scan, if a log entry is detected with amplitude at or above the failure threshold, the "Fail" flag bit is set. This flag cannot be reset without clearing the log.
2. Bit 0 is used as the "Burnished" flag, indicating that this asperity was not detected again at the end of a burnish operation.
Notes on "Ignore defects on Skipped tracks" (cword 2 bit 14)
1. "Ignore defects on Skipped tracks" (cword 2 bit 14) is applicable only if the "Scan Defects for TA's" (cword2 bit 8) is enabled.
2 The check would only be meaningful with the additional skip track padding added by running test 126 with skip track padding prior to running test 134.