Seemingly, the A drive is determined by the right most bit. I have changed the numeric values and had no success. Hopefully this makes more sence to you than it does to me!
If you want to hack the Registry directly, you have the right key but the wrong value. The value is NoDrives with a REG_DWORD value. An entry of 3 will remove the A and B drives. An entry of 4 will remove the A, B, and C drives.
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