I have a 500GB time capsule that quickly ran out of space with my 27" iMac 1TB drive. I wanted to buy a Guardian MAXimus 1.5TB Raid-1 Hard Drive for $360 to do my backups. The cost was high and I decided to look into replacing the Time Capsule drive. I bought a 2TB Western Digital Green internal drive for $130 and replaced it using the Hardmac instructions. The 2TB Green drive runs near silent and is a lot cooler than the original 500GB drive. The swap was easy to do, but I destroyed the rubber mat glued on the bottom. I bought a Rosewill enclosure for $23 for the 500GB drive. I considered buying a FW800 enclosure, but that was $60 and it didn't seem worth it for a back up drive.