fd(4) -- Linux man page
NAME
fd - floppy disk device
CONFIGURATION
Floppy drives are block devices with major number 2. Typically they
are owned by root.floppy (i.e., user root, group floppy) and have
either mode 0660 (access checking via group membership) or mode 0666
(everybody has access). The minor
numbers encode the device type, drive number, and controller number.
For each device type (that is, combination of density and track count)
there is a base minor number. To this base number, add the drive's
number on its controller and 128 if the drive is on the secondary
controller. In the following device tables, n represents the
drive number.
Warning: If you use formats with more tracks
than supported by your drive, you may cause it mechanical damage. Trying
once if more tracks than the usual 40/80 are supported should not
damage it, but no warranty is given for that. Don't create device
entries for those formats to prevent their usage if you are not sure.
Drive independent device files which automatically detect the media
format and capacity:
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