Thanks to intern Errol Pierre-Louis for this review!

Photographers, real estate people, graphic designers, and anyone else who works with large data files but doesn't want to purchase an expensive portable hard drive: The StarTech InfoSafe 2.5" USB 2.0 On-The-Go Drive Enclosure offers a secure way to take your files with you. It can turn any compatible 2.5-inch hard drive into a travel-size storage unit.

The On-The-Go Drive works without a PC: You can hook it up to a USB device, like you would a digital camera or MP3 player, and with one button, transfer all your files to the enclosed hard drive.  It's hot-swappable, so you can connect and disconnect it while the computer is running, and you can power it with an included battery pack that requires 4 double-A batteries. I wouldn't call it pocket size, but it's slim and doesn't take up much space.

To use it, you need a hard drive formatted with FAT 32. You have to push in the side tabs holding it in place--harder than it sounds. The instruction manual suggests using a pen or a screwdriver. You then slide out a tray of clear plastic with an adhesive strip, fix your hard drive to the tray, pop it back in, and voila: You've got yourself a portable hard drive. The IDE enclosure we looked at costs $62.99, and the SATA version goes for $69.99