[Mr-Me-II]

You could put them all in yes, but if they are all ATA you won't have anywhere to plug in your CD drive(s)

The 10gb drive would be almost useless, maybe use it as a backup for photos but thats about it. It being 10GB it is probably ATA66 or lower, with 1mb cache or lower, so it would be much too slow for any real use.

Using one drive for Windows and another for Games is always a good idea. Once a hard drive gets about 60-70% full, it will start losing performance in my experience.

In short, replace the 10gb with the 120. Assuming you use the 10gb as a slave in an ATA system, just check the back of the 120 hard drive for the Jumper (small plastic peice covering two pins). There will be a diagram on the drive somewhere explaining where to place this for a Slave configuration. Adjust the jumper accordingly and put it in the place of the 10gb.

In ATA, the slave plug is the one about 2/3 down the cable. Master is the one at the end closes to the slave. Motherboard gets plugged into the one farthest from the Slave plug. The end for the motherboard is usually Bluw but not always.

Also,as of this post, you have 666 posts bulldog