I just installed a 2nd hard drive - a Maxtor DiamondMax Plus 120GB Ultra ATA/133. I read that it's best to set the old drive jumpers as "Master" and the new hard drive as "Slave." I know that with the new drive, all I had to do was remove all the jumpers to get it to ""Slave" mode. What I'm having trouble with is the old drive. Someone told me that I should have left the jumpers on the old drive in their original position because they are already set as "Master." Problem is, I moved the jumpers around so much that I can't remember how they were originally set! The old drive is a WDC WD102BA ATA (is that a Western Digital??). There are 5 vertical positions that the jumpers can be placed. Do I use one or both or none or is there some specific way to set these things??? I've got the connector cables on right but these jumpers are a pain. And because of this, the new hard drive is not being recognized. I am going nuts over here. Someone please help me... I would really appreciate any advice. Thank you!