Never heard of a native USB drive, I always assumed there was a USB to IDE/SATA bridging chip. Off to get learned on this.
I wouldn't be surprised to see this still being the case, with the bridge chip being moved directly onto the hard drive PCB instead of a converter PCB in the drive enclosure.
Most of the first fibre channel drives I worked with did similar. The connector on the drive hooked it directly into the FC network of the multi drive enclosure. The enclosure then was 100% pure FC connections. The drive was doing the FC to SCSI conversion onboard it's own drive controller.
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