Compaq Deskpro AP550 Reference Manual page 52

Computer Setup
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B-6 Computer Setup
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Option Description
Translation Mode
CAUTION: Ordinarily, the translation mode selected
automatically by the BIOS should not be changed. If the
selected translation mode is not compatible with the
translation mode that was active when the disk was
partitioned and formatted, the data on the disk will be
inaccessible.
Translation Parameters
Multisector Transfers
Quiet Drive
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