estern Digital added 2.5 TB and 3 TB versions to its family of WD AV-GP SATA hard drives. The 2.5 TB and 3 TB capacity, 3.5-in., WD AV-GP hard drives offer 24/7 reliability, low power consumption and unrivalled storage capacity for storage-intensive AV applications such as digital video recorders, video surveillance, single-drive media servers and external multimedia storage, the company announced. The products feature power-saving WD GreenPower Technology and performance capabilities to capture up to 12 simultaneous HD video streams with SilkStream technology. The WD AV-GP drives are field tested to have a 1.0 million hr. MTBF rating. Drives with capacities in excess of 2.19 TB currently present barriers for certain PC hardware, firmware and software. For example, drives larger than 2.19 TB are not supported by systems running Windows XP; and systems with 32-bit versions of Windows Vista or Windows 7 relegate drives larger than 2.19 TB to be used as secondary drives.