Dell Dimension XPS D Series Reference And Troubleshooting Manual page 149

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Multi-sector Determines the number of sectors per block during multiple-
Transfers sector transfers. If Type is set to User, set Multi-sector Transfers
to 2, 4, 8, or 16 sectors per block or disable the feature.
LBA Mode Set to Enable (default) unless directed to change it by a Dell
Control technical support representative.
Transfer Mode Selects method of moving data to and from the EIDE drive.
Options include Standard and the PIO modes 1, 2, 3, and 4,
which can improve the performance of a hard-disk drive. (The
higher the PIO number, the faster the transfer; most newer
drives support PIO 4.) For the optimum transfer mode, set
Type to Auto. If Type is set to Disabled, PIO is turned off.
NOTE: The Glossary in the Online Guide defines abbreviations and acronyms.
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System Setup Program B-7