Sony M-PF88E - Manual (Page 4)

An error displays that says the A:\ drive is not accessible.
Be sure the Standard BIOS setup is set correctly for your floppy drive (most are 3 1/2
inch, 1.44 MB). If you have more than one floppy drive, check to see if Floppy Drive
swapping is set to Enabled in CMOS. Make sure the floppy disk is not write-protected.
Try another floppy drive. Replace the floppy cable. If the floppy drive LED stays on all
of the time, you have the flat cable plugged in backwards on either the motherboard or
the drive; the red stripe should connect to pin 1. You could have a bad box of floppy
disks. After running a virus scan on the floppy disk, try the floppy disk in another
computer.
What causes a USB Floppy Disk Drive to fail?
There are 3 possible reasons why a USB device will fail to operate:

Bad or incompatible hardware (the drive itself)

Bad or missing device drivers (software controls the device)

Mismatched cabling (wrong type of cable)
To help determine the nature of the issue, answer the following questions:
1. Does the floppy disk drive work when connected to a different USB port?
If yes, there is an issue with the first USB port.
2. Does the USB drive work on another computer?
If yes, the problem is a driver issue.
3. Does another USB device work on this computer?
If yes, the issue is most likely with the floppy disk drive.
4. Is the floppy disk drive connected to a USB hub or to another device?
If yes, connect the device directly into a USB port on the computer.
5. Did the device come with its own cable?
If no, then check or replace the cable.