enclosure?

so you want to buy something and you don't no what it does. Wow. if your looking for a hd caddy this holds a hard drive that you can put in your laptop. if your looking for a external hd enclosure, this is a case that you can put a desktop or laptop hd in and use a usb cable to access it. if your looking for this then you can get them from most compuer companies on the net not dell.

if it's a dell laptop call spare parts at 800-372-3355

If you're talking about an external drive enclosure, it allows you to mount the drive externally by USB or firewire.

Newegg.com has a boatload of different drive enclosures.