Failed FDC means that the Floppy Disk Controller is no longer responding. Possible solutions to this issue are to replace the FDC (not so easy on integrated MBs) or possibly replace the floppy drive. This can also occur when the ribbon cable connecting the floppy drive is not inserted correctly.
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Floppy Disk Controller
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Look harder. In 1973, Britain minted - * Two New Penny (Proof
FDC) * One New Penny (Proof FDC) * One New Penny for general
circulation * Half New Penny (Proof FDC) * Half New Penny for
general circulation