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AST RESEARCH, INC. TECHNICAL BULLETIN #TB-0371 1-20-88
PREMIUM/286 - AST FIXED DISKS
This Technical Bulletin defines the acceptable quantity of
defects allowed on an AST fixed disk drive.
ALLOWABLE LIMIT OF BAD BYTES PER DEFECT:
10,240 bytes per defect if a cluster is composed of five
sectors. 12,288 bytes per defect if a cluster is composed of
eight sectors.
ALLOWABLE LIMIT IN MEGABYTES:
One defect per megabyte of unformatted capacity is acceptable
for AST fixed disk drives.
i.e.
A 40MB fixed disk drive which has 53MB of unformatted capacity
may have up to 53 defects. This results in 53 X 10,240 or
542,720 in bad bytes. Formatted capacity of this drive is 44.5
MB. With 542,720 bad bytes, more than 40MB of usable disk
capacity exists.
If the defects on a fixed disk exceed the limits specified in
this Technical Bulletin, contact AST Product Support.