Just for info in case you have to examining such a drive in and out of the enclosure
Buffalo DriveStation External USB2.0 Hard Drive 3.0 TB
Internally this is a 3TB Seagate 512E sata drive
Barracuda 3000GB ST3000DM001
with what at first looks like strange partitioning
349GB ‘NTFS’ partition
1698GB unallocated partition
746GB unallocated partition
Externally, over USB (USB 2.0)
appears as 2.7TB drive with 4K sectors and MBR layout with a single partition
So looks like the USB interface does something non-standard
or maybe knows how to put it into native 4K mode?
There is no encryption
There is a Buffalo formatting utility that can set it up differentlt eg as a GPT disk with 512byte sectors
but by default it comes as MBR 2.7TB using 4K sectors
and a few files on it
The internal (sata) partitioning
out of the box shows
349GB ‘NTFS’ partition
1698GB unallocated partition
746GB unallocated partition
After using in drive in USB mode and filling it with 1.5TB of data
internally at the sata 512e level it still shows the same
The 349GB ‘NTFS’ partition is in fact the entire drive
but in 512e mode it is just showing the first 512byte bytes of each real sector
The rest of the data (the other 3.5k of the 4k sectors) possibly occupies the appreantly empty areas
but I haven’t looked into that more deeply yet
(This is the 3TB drive mention here
viewtopic.php?f=1&t=26068&p=183588&hilit=ST3000DM001#p183588Another thread on here mentions something similar
viewtopic.php?f=1&t=24418&p=164592&hilit=buffalo#p164592but there is no Inito chip or encryption on mine
They also do a 2TB version, but that just presents normal MBR partition with 512byte sectors