I wish I had a way to mount at least one more exhaust fan. The 10,000 RPM hard drive generates some serious heat.
I have considered punching a hole in the top of the case and mounting an 80mm fan to exhaust hot air out the top. I'm hesitant to do this because there are no do-overs if I screw it up. AT cases are hard to find nowadays.
Originally, I had a 2gb IBM SCSI hard drive in this PC. I later added-on a second 4gb IBM hard drive. Around 2002 and after 4+ solid years of heavy use, both of those drives started to fail. I replaced them with the 10,000 RPM 18gb drive you see in the pics. Unfortunately, it too failed quickly and I RMA'd it. Then, that replacement failed too. After the third replacement also failed, I began to suspect that the drives were cooking themselves to death. To cool the drives, I bought one of these and ran it for a few years (except mine was a generic white version):
I also attached one of these to the bottom of the drive (which you can't see in my photos):
Although the drive did not fail again, I suspected that the massive heatsink on top wasn't making good contact with the top of the hard drive. To test it, I smeared on some TIM, mounted it again, and then removed it. Sure enough, only about 15% of the heatsink was making contact. I then chucked the heatsink cooler, put the 5.25" bay covers back on, and installed this ThermalTake TMG-HD1 which you can see in my pictures:
It's a really good hard drive cooler. I especially like how the fan can be removed and turned over to reverse flow (which I did). Since the fan can be removed, it can also be replaced when it fails. The downside to this cooler is its massive size. With the drive itself, this cooler, and the other cooler on the bottom of the hard drive, the whole setup is consuming two full 5.25" bays. However, I am confident that my 10,000 RPM drive will not fail due to overheating again.
If you look in the top-left of my open PC case, right under the PSU, you can see two additional brand-new 4gb ultra-wide SCSI drives that are not connected. A friend had those and he was going to throw them out. I asked if I could have them and I've kept them as spares ever since.