I have 5x WDC Black 1TB's... but most of them aren't in my PC... I use them for critical backups and store them externally in various locations in ESD Pelican cases.

I have an e-SATA dock station on my desk from Thermaltake that makes it really easy to access each of these drives... plug n play.

Gotta love 1TB for under $100. These also come with 5 year warranty vs traditional 3 yr for WDC's.