The Adaptec ACS-100 USB 2.0 Enclosure is a solid silver fanless USB 2.0 external aluminum enclosure supporting PATA 3.5" hard drives. PATA is synonymous with EIDE, UATA, Parallel ATA, and Ultra ATA. Any of those drives will work in this enclosure. SATA drives will NOT work with this. Don't try using an adapter either, because it'll just make the back of the enclosure hang out.
Unlike some external enclosures, the Adaptec ACS-100 doesn't require mounting the drive in a bay -- you just attach the back and slide it in. This means it's a bit smaller than other enclosures, and it's easier to switch out drives if you have multiple drives but only one or two enclosures. Heat is dissipated by the metal enclosure via contact with the drive and as such it gets fairly hot, so don't touch it too much while it's in use. It comes with an AC adapter to power the drive and enclosure.
The front of the device has a blue LED that flashes red when the drive is being accessed, or is solid red when there is an error. The cables go in the back, meaning you don't have a mess of cables hanging down just so you can see the LEDs, like some other enclosures. The exterior of the enclosure is silver colored
This is my favorite external enclosure. I got a great deal on it and bought several. Most enclosures are identical in terms of performance, only differing in design. So if you can find a deal on this, have some spare PATA drives laying around, and a silver enlcosure fits your color scheme, pick a few up.