Original Wireless, Inc. @ Amazon.com: hard drive
AV-GP WD5000AVDS 500 GB 3.5" Internal Hard Drive by WESTERN DIGITAL $4.99
Caviar Blue WD1600AAJS Hard Drive by WESTERN DIGITAL $3.99
Western Digital Scorpio Blue WD5000BPVT 500 GB 2.5 inch Plug-in Module Hard Drive-SATA/300-5400 rpm-8 MB Buffer-Hot Swappable-by WESTERN DIGITAL $3.99