AT&T 3B2 Off-Line Diagnostic Manual page 528

Phase Descriptions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Phase #18 - HDC XD Recalibration Tests
Phase Name:
Type:
Function:
Tests:
Time:
Warnings:
Notes:
Expansion Disk (XD) Recalibration Tests (xdc_4)
Demand
This phase tests the ability of the XDC to return to cylinder 0 from various
regions of the hard disk.
Test 1 - uses the specify command to initialize the NEC chip.
Test 2 - returns the heads to cylinder
o.
Test 3 - seeks to cylinder O.
Test 4 - reads sector 0 to determine the physical size of the disk.
Test 5 - tests for read command completion of disk.
Tests 6 through 9 - seek to various regions of diskO.
Tests 10 through 100 - no tests run.
Tests 101 through 109 - are identical to Tests 1 through 9 except disk1 is
tested.
5 seconds
None
This phase is designed to test the ability of the disk to move its head to
cylinder 0 (not by seek). The disk is divided into four regions. Recalibration is
performed from each of the four regions. The test sequence is as follows:
A seek to one-fourth of all cylinders from the rim is done.
Recalibrate
A seek to one-half of all cylinders from the rim is done.
Recalibrate
A seek to one-fourth of all cylinders from the spindle is done.
Recalibrate
A seek to spindle is done.
Recalibrate.
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