Hi,
If it does not detect the 2nd drive or does not detect any drive, then your problem is a low-level one : there is a (physical) conflict on your IDE channel(s).
You've been normally been granted with 2 IDE ribbon cables, each with 3 connectors. The first of the 3 connectors is plugged on the motherboard. The two others are for peripherals. When you want to install 2 hd, you may use 2 different connection schemes : one disk on each cable, that is one disk on each ide port (IDE-0, IDE-1), or both disks on the same cable (port, slot).
I prefer the second one, so i'll explain how and why to connect your drives this way.
How : the first disk is that you already have with your os installed. It must be connected to the last plug. The intermediary plug will be plugged into the new disk.
As you will have two disks one the same cable, you must set up one as 'master' device and the other as 'slave'. Only master devices have the ability to boot.
All disks have on their rear panel a set of 8 or 10 pins that precisely define if the device will behave as a 'master' or a 'slave'. By covering a pair of pins with a jumper cap, you will change your drive's setting.
Check out your drives' manuals (and/or manufacturer website) for technical schemas that will instruct you which pins to cover.
If you set the system drive (holding the os files) as master and the other one as slave, you'll have no problem anymore.
Make sure you use the 80-pin ribbon cable (sometimes holding a blue connector on the motherboard side) : hard disks need those cables to work at maximum speed. The other cable manufacturers often supply is a 40-pin cable which is slower but sufficient for reading cd's.
The cd-rom drive should be set up as secondary master device (thus alone on IDE-1).
... Tell us what you get
Cheers and good luck !
The first time I installed a second drive, I thought I was becoming mad ;-) Actually it's a piece of cake since the second time.
Grunt
