AT&T 6300 Service Manual page 268

DIAGNOSTICS
8 - FUNNEL TEST: This Test Will Erase All Files on the
Disk. The funnel test writes an incrementing pattern (first three
bytes are usually the cylinder, head, and sector) to the disk. The
pattern of the write, read, and verify is, however, different. Each
cylinder/surface is written one sector at a time. The sectors are
written in the following manner: start sector, last sector, start
sector +1, last sector -1, and so on down to the center sector. The
surface pointer is then incremented and the process repeated until
all cylinders have been tested in this manner.
9 - AGING TEST: This Test Will Erase All Files on the
Disk. The aging test is a very long test. The sectors are written
and verified individually. Then all sectors previously written are
read and verified.
10 - FULL EXERCISER: This Test Will Erase All Files on
the Disk. The full exerciser test performs tests 1 through 7
repeatedly.
11 - WRITE & VERIFY SURFACE: This Test Will Erase
All Files on the Disk. This test writes once as per the data
pattern test and then performs the read/verify function of the
data pattern test. It also produces the bad block list.
12 - LOW LEVEL FORMAT: This Test Will Erase All
Files on the Disk. This test sets up the sectors and their
addresses to provide the hard disk controller with information
about the drive during the initial setup.
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