What's a terabyte? It's not all that long ago when you could have been forgiven for asking this question, but with in these days of DVRs and pocket-sized HD camcorders we've become more than familiar with the term. Now Seagate has thrown data storage-hungry consumers another tasty bone with the release of the world's first 3TB external hard drive, the FreeAgent GoFlex Desk.

The 3.5-inch external drive comes standard with a USB 2.0 interface, but this can be upgraded to a USB 3.0 or FireWire 800 connection using a desktop adapter. USB 2.0 transfers data at 480Mbit/sec while USB 3.0 gets up to 4.8Gbit/sec and FireWire 800 is 800Mbit/sec. I know which one I'd be going for when dealing with a drive that holds more than 100 HD movies.

The drive's 6.22 x 4.88 x 1.73-inch enclosure can sit either vertically or horizontally and compatibility is boosted with an included New Technology File System (NTFS) driver for Mac, which means files from both Windows and Mac OS X computers can be stored on the drive without reformatting. There's also automatic backup software for PC & Mac and AES 192-bit encryption (for Windows OS).

The Seagate 3TB GoFlex costs $249.99.