Older DS2 hard drives can easily be replaced. All you need is a IDE - USB enclosure ($30.00) and the new drive. Format the drive, load the appropriate image from DM web site, and install the drive. I use the Seagate SV35 series drives designed for 24/7 recording operation and carry 5 year warranty. Downloaded the free HD utility from Seagate to format the drive. 320GB ATA100 is around $100.00. What file system do you use when formatting FAT unix?