Which hard drive do you have and does it have standard SATA connections?
The hard drive typically found in a Time Capsule is the Hitachi Deskstar, which is sold by Hitachi as a consumer-grade product—the Hitachi Ultrastar is the enterprise version.[13] Apple labeled the drive as a server-grade drive in promotional material for Time Capsule, and also used this type of drive in its discontinued Xserve servers. Apple states that the Hitachi Deskstar meets or exceeds the 1 million hour mean time between failures (MTBF) recommendation for server-grade hard drives.[14]
The 500 GB, first generation Time Capsule shipped with a Seagate Barracuda ES-series drive.[15] More recently, other hard drives such as the Western Digital Caviar Green series,[16] and the Samsung EcoGreen series have been reported.