I need to replace a Western Digital AV WD3200AVJB 320GB 7200 RPM 8MB Cache IDE Ultra ATA100 / ATA-6 3.5" Internal AV Hard Drive for an American Dynamics EDVR that is connected to a security camera. This HD is no longer made. Can someone point me to a HD that would be compatible? I found a Western Digital AV-GP WD3200AVVS 320GB 8MB Cache SATA 3.0Gb/s 3.5" Internal AV Hard Drive -Bare Drive. Would that work? I also found Western Digital Caviar Blue WD3200AAJB 320GB 7200 RPM 8MB Cache IDE Ultra ATA100 / ATA-6 3.5" Internal Hard Drive but does it need to be an AV?I contacted Western Digital but they said that I needed to contact the motherboard manufacturer. I just need a replacement for the existing drive. Can anyone help? Thanks.