Pretty sure it's a regular internal drive in an external case... This is really a long story, but basically I bought it with a Mac G4 tower and they said I'd have to do that, make it an internal. For other reasons I took the G4 tower back and got this PC. Like I said, long story, but I was advised it would work (albeit not "officially") when I bought it. Leading me to consider the jumpers.
Oh yeah, since I put the DVD-R in, Nero's been crashing the whole system when I start it. That tells me Windows can see it, but isn't. Hmm.
The actual interface of the drive is IDE. Hooks up perfectly to the IDE cable. It's in my box now, alongside a CDRW/DVDROM drive, and they both connect exactly the same way.
I would say the enclosure is VERY good, but the fan is about 30mm. The drive gets covered in an aluminum slip, but there's a good amount of air space in there otherwise. The drive's like 16" deep, 3" tall, 7" across. It's big. Not saying it would be perfect for heat, but it's not like my external HD, a Western Digital. This one's much smaller, little bigger than a 5" drive.
Here's a pic of the Firewire enclosure I pulled the DVD-R drive out of. The Acer 56x CD-ROM reader I took out for the DVD-R drive (they're the same size) is sitting atop it, backed into the far corner, so you can see the difference in size.
LaCie makes some pretty good stuff. If you want to wear a grin for the rest of the day (no kidding) look up their Bigger Disk Extreme. 1,600GB RAID array of high-performance 400GB drives. They're not WD SATA Raptors, but they're supposed to be pretty good.