first disconnect your PC from the mains a supply. Open the system case (if it's an upright 'under the desk' case, remove both side-panels). Remove the power-cable and the flat ribbon cable from the hard disk. Remove four screws which hold the disk in place (two each side). Slide out the disk. At the back of the disk you'll see a row of 3 or 4 pairs of pins with a black 'jumper' across two of them - this is where you configure the disk as 'master' or 'slave'. For your purposes it needs to be set to 'slave'. There should be a diagram on the drive, near the back, or some small markers near the configuration pins, showing where you need to place the jumper to make it the slave, so slide the jumper off it's present position and reposition it accordingly.
Now disconnect your other PC and remove side panels on that. Find the flat ribbon cable that goes to the hard disk. There should be another (unused) connector on it, approx halfway along it's length, and a spare bay under or above the existing drive. Slide your disk into that bay and use the screws you removed from the other PC to hold the drive in place at both sides of the PC chassis. Another final check that the drive retaining screws each side of the drive bay are tight (but don't overdo it!)
Now get hold of that spare ribbon connector and push it home squarely and firmly into the wide socket at the back of the disk, with the red stripe on the flat cable nearest to the power socket on the disk. Now find a spare white molex connector (the larger of the two sizes) which should be hanging from the bundle of wires inside the PC and connect that to the drive's power connector (it's shaped to fit only one way with the corner-cutouts at the top). Make sure the flat ribbon connector and molex power connector are attached firmly to the drive.
Replace the sides of the pc case. Connect to the mains and power it up. The PC should automatically detect the slave drive and it should be visible as a new drive letter in Windows 'My Computer'.
Edited by pip22, 18 July 2007 - 05:33 PM.