Sorry, but it's silly question time. I have got two HDDs, one being a master and the other a slave. I had a problem and had to reinstall my OS which is WinXP Pro. I now wish to replace one of the drives with a larger one but not really paying proper attention when I reinstalled Windows I am not sure which of the drives I put it on. It looks, by going into Program Files, that it is on my F drive but there is not actually any folder I can identify as XP. I have tried removing the power lead from each drive one at a time and then rebooting but it won't unless both drives are powered up. Does this mean that the OS must be on the drive which is configured as the slave? Told you it was silly question time. Any advice would be appreciated.
Go to Explorer>tools>folder options>view and put a dot into 'show hidden files' and untick 'hide protected operating system files' (accept the warning that comes up). Now click on each of the disks in turn until you see a folder called Windows, that is where your os is, not inside the programs folder. When you have finished, reverse the 2 instructions above