Western Digital AV-GP 750GB Serial ATA internal hard drive

AV GP WD7500AURS - 750 GB, 3.5'', IntelliPower, SATA 3 Gb/s, 64 MB 24x7 reliability.
These drives are designed to last in always-on, streaming digital audio/video environments such as PVRs, DVRs and surveillance video recorders.

Reduced power consumption.
With the combination of WD's IntelliSeek, IntelliPark, and IntelliPower technologies, WD has reduced power consumption by up to 40 percent compared to competitors' drives.

Whisper quiet.
Noise levels have been minimized to less than one sone – virtually below the threshold of human hearing.