On 08/12/2013 01:20 PM, Toby Bluhm wrote: > I've gone through the same scenario. I believe the USB > layer/interface/driver/whatever in C5 is the pinch point. I have SATA > attached GPT labeled 3TB disks working just fine in C5. Put the very > same disk in a USB enclosure and it's not recognized as 3TB - sees it > as some fraction of its true size. More likely it's the USB host controller on the USB-SATA interface board that's the pinch point. For the direct SATA connection, the drive may go into the 512e mode of the advanced format; perhaps the USB-SATA interface tells the drive the go into the 4k native mode during enclosure powerup? That would make sense for the symptoms you're seeing.