I also am trying to install an additional hard drive. I wanted to add an external hard drive, but also heard the cheapest thing to do is to buy an internal hard drive and an enclosure, then put them together making a hodgepodge external HD. So I bought a 90 GB hitachi hard drive and a firewire enclosure. It seems like the primary purpose of the enclosure is to somehow convert the in/out of the 40-pin hard drive to a firewire cable that goes into the back of the computer tower
Mechanically everything went together well, and the hard drive spins up when it gets power. When the firewire is plugged into the tower, I get the upbeat "duh-dum" sound that I usually get when I plug in a firewire video camera or USB disk. The only thing is, the drive does not show up under "my computer." After the sound I get no further prompts or Windows help. I checked the device manager under 'hardware' tab for 'system' in the control panel. The device manager says I have a firewire device under "Disk drives" and says the device is working correctly. When I check "properties" and go to the "volume" tab, no data about the hard drive is displayed (even after clicking "populate.
I don't know why Windows XP doesn't show my hard drive on "my computer," or how it recognizies it without recognizing it completely. I also don't know for sure how the jumper pins should be set on the back of the internal component of the hard drive i made. Manuals for the hard drive and enclosure say they should be set to "Device 0 Master," but a friend of mine said master hard drives are what contain the operating system, not just extra disk space. I have tried the same procedure for plugging in the firewire with the pins set for "Device 0 Master" and "Device 0 Slave." Neither seem to work.