Can someone explain to me what is going on with a hard drive because I can;t explain it. I had a pc with a 40GB hard drive which was full so decided to fit a 160GB drive, I installedit but before I turned on the pc I decided to disconnect the old drive. I then formatted the new drive and loaded windows onto it. I then reconnected up the old drive, having checked jumper settings were correct and booted up the computer. The BIOS detected both drives but once in windows the old drive was not shown in "My Computer", it was there in device manager and in "disk management" but was showing as offline and unformatted. I then booted up from a cd with puppy linux on it and the small drive was not detected at all. I am at a loss as to what has happened to the drive as all I have done is disconnect it and then connect it up again. How do I get at the information on the old drive?