Could be that Windows needs to be jolted into believing the drive is still there. Try removing the power lead and IDE cable from the missing drive then reboot the PC. Check the BIOS to make sure the drive isn't listed. Then switch off, reconnect the cables and see if Windows sees the drive again.
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Do you know that we're all in line for succession to the throne? Really?
Well, if forty-eight million, two hundred thousand, seven hundred and one people died I'd be Queen.