Dell Dimension XPS 50 Reference Manual page 147

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Diskette controller Configures diskette drive interface. Options are Auto,
Enabled (default), and Disabled.
Diskette A Identifies the boot diskette drive in the computer. The
default is 1.44/1.25 MB 3
Diskette Write Protects a diskette from being written to when set to
Protect Enabled. When this option is set to Disabled (default), the
diskette is not protected unless the write-protect tab is in
place.
NOTE: The Glossary in the system Help defines abbreviations and acronyms.
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System Setup Program B-13