This article was previously published under Q321697
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Virtual floppy disk drives may exist on a computer. For example, they may be created by a virtual disk driver. If virtual floppy disk drives exist, the driver for the Floppy Disk Controller (Fdc.sys) may treat them as real floppy disk drives. It may report them to the Plug and Play Manager.
The system then incorrectly assigns extra drive letters for these virtual floppy disk drives in Windows Explorer. Therefore, you may find more than one drive letter for every virtual drive in Windows Explorer. Some of these drive letters do not point to the correct virtual drive.
The following registry override was provided to force Fdc.sys to physically probe the floppy drives to determine whether the floppy drives actually exist or whether they are only virtual drives. If they are virtual drives, it does not report them.
However, because of a bug in the Fdc.sys driver, this override value does not go into effect. Therefore, it is not useful.