a barracuda is all you need - High capacity disk

The Seagate 1.Terabyte drive is one of the largest drive in its class and features a 7200RPM spindle speed, 32MB cache.

BUT those are just words.

let's put it in this way: it's absolutely fantastic. it has all the space you need (if you're not running a router) Even if less capable than his bigger brother (the 1.5tera one) its speed's amazingly high and his affidability has been proved (however, remember to check for updates in the firmware from time to time. do backups, kids.

This drive uses a SATA interface to receive and deliver data.

Interface
SATA 3Gb/s NCQ

Cache (MB)
32, 16 and 8

Sustained Data Rate (MB/s)
up to 120

Spindle Speed (RPM)
7200

Shock, Operating:
2 ms (Gs) up to 65

Shock, Nonoperating:
1 ms (Gs) up to 350

Acoustics, Idle (bels)

2.7 (1.5 TB, 1 TB, 750 GB and 640 GB)
2.5 (500, 320 and 160 GB)

Acoustics, Seek (bels)

2.9 (1.5 TB, 1 TB and 750 GB)
2.8 (640 GB and 500 GB)
2.6 (320 and 160 GB)

Operating Temperature (C) 0 to 60

MTBF (hours) 750,000

Annualized Failure Rate (AFR) 0.34%