Problem booting up Fedora Core 5 After Adding USB Floppy!

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Hi All,

Any help with the below would be great.
I added an entry into my "stab file" while in root. It was to activate a usb
floppy drive. Now I can no longer boot up normally into linux but am told I
have a file system error and I can hear  the usb floppy drive being
activated. I think fedora is looking for a linux file system on a floppy
disk. It is giving me choices to do a repair of the file system or just
reboot which only brings me back round to the same situation again. I really
need to edit the stab file but can't get access to it as everything seems to
be "read only". Not even sure if I can locate the Stab file in this root
environment.
I tried unplugging the USB floppy and restarting the computer but still no
success.
Here is the line I entered in the stab file:
/dev/sda    /mnt/usbfd       auto            n

Many thanks for any help.

Paul.