A floppy drive may not work because of any of the reasons listed below:
Bad floppy diskette.
Incorrect settings in CMOS.
Conflict with other hardware.
Connection incorrect.
Bad drivers.
Bad floppy drive.
Drive failure
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Bad floppy diskette.
Verify the floppy diskette that you are trying to read from is not write-protected or bad.
The floppy disks are very fragile and hence they easily become bad. Check with a known good floppy disk to see if it works in your drive.
