AT&T 6300 Service Manual page 267

DIAGNOSTICS
o -
RETURN TO MAIN MENU: Returns to the Main Menu­
MENU A.
1 - DRIVE READY TEST: The drive ready test checks the
drive ready circuitry of the HDU. If the drive is not ready in 15 to
17 seconds, a Time Out error message is displayed.
2 - CONTROLLER HARDWARE: This test checks the hard
disk controller board. This test writes, reads, and verifies all
possible data to the ports that allow both writes and reads.
3 - DRIVE HARDWARE: This test checks the hardware of the
hard disk drive itself.
4 - SEEK TEST: The first seek is to the last cylinder, the second
seek is to the first cylinder, the third seek is to the last cylinder
-1,
the fourth seek is to the first cylinder +1, and so on.
5 - VERIFY SURFACE: This test verifies the surface of the
HDU, taking into account the contents of the bad block list.
6 - TEST CYLINDER READ/WRITE: This test writes data to
track 305 of the HDU, then reads and verifies the data.
7 - DATA PATTERN TEST: This Test Will Erase All Files
on the Disk. The pattern test writes all cylinders with a data
pattern, and then verifies that pattern. The disk is written from
the first cylinder to the last cylinder. This sequence is then
repeated from the last cylinder to the first.
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