Use it as a backup drive, store bulky video files or archive your mp3 collection. However you use it, this Western Digital drive is the most convenient way to store your files with lightning-fast data transfer. Originally $149.99, this robust hard drive is now just $99.99! That's less than one hundred bucks for an additional 500 gigs of storage. Mac users, use this robust drive to retrieve data with the Time Machine application on Leopard- you'll never lose important documents again.