I’ve searched the forums and seen some posts about people with 3tb drives only being recognized as 2.2tb, but my case is a bit different. I have an internal Caviar Green drive that’s 3tb and mounted in an external USB enclosure and is only being seen by Windows as 746.39gb. Does anyone know how I …

AIUI, the firmware in most older external enclosures is limited to 32-bit LBAs. This means that the maximum addressable capacity is 2TiB, which corresponds to a maximum LBA of 0xFFFFFFFF. The USB-SATA bridge chip in the enclosure retrieves the drive’s capacity by issuing an ATA Identify Device comm…

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3TB Internal Drive as 746GB

WD Internal Drives Desktop & Mobile Drives

Cronus February 23, 2012, 4:50am 7

It was the enclosure. Thanks for all the replies guys. Time to go look for an enclosure with a 64 bit controller.