Power-conserving WD AV-GP hard drives are based on the WD GreenPower Technology platform designed to deliver power savings as the primary attribute. These SATA drive are equipped with IntelliPower technology, fine-tuned balance of spin speed, transfer rate, and caching algorithms designed to deliver both significant power savings and solid performance. With power reduction of up to 40 percent, they deliver cool and quiet operation and reliability that is perfect for audio video applications such as PVRs, DVRs, set-top boxes (STBs) as well as surveillance video recording.WD Advanced Format technology increases media format efficiency, thus enabling larger drive capacities. WD Advanced Format drives are specifically optimized for Mac and the latest Windows operating systems such as Windows Vista and Windows 7. WD Advanced Format drives work with legacy operating systems such as Windows XP but require the use of the free WD Align software.