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