I have a Mediasonic Smart Drive SuperSpeed 3.5" SATA HDD External Enclosure - USB 3.0 [HD6-SU3-BK]. It has the VIA VL700 - Super-Speed USB 3.0 to SATA controller which is supposed to support 3TB drives. The drive is an Advanced Format 3TB WDC WD30EZRX. I'm running 64bit Oneiric with the standard 3.0.0-16-generic kernel.
usb controller: ATI SB700/SB800 USB OHCI0 Controller ATI SB700/SB800 USB EHCI Controller ATI SB700/SB800 USB OHCI0 Controller ATI SB700/SB800 USB EHCI Controller ATI SB700/SB800 USB OHCI2 Controller ATI SB700/SB800 USB OHCI0 Controller ATI SB700/SB800 USB EHCI Controller NEC USB Controller
When the drive is connected to the internal SATA controller, I can access the whole 3TB, partition it with a GPT table and format it using XFS. When I put the drive in the enclosure, I can only see 746.52 GB.
Here's how the kernel sees the drive when it's connected to the internal SATA interface.
2.855426] scsi 6:0:0:0: Direct-Access ATA WDC WD30EZRX-00M 80.0 PQ: 0 ANSI: 5 [ 2.855608] sd 6:0:0:0: [sdc] 5860533168 512-byte logical blocks: (3.00 TB/2.72 TiB) [ 2.855611] sd 6:0:0:0: [sdc] 4096-byte physical blocks [ 2.855619] sd 6:0:0:0: Attached scsi generic sg2 type 0
Here's how the kernel sees the drive when connected via the USB enclosure.
[605703.368137] usb 2-5: new high speed USB device number 3 using ehci_hcd [605703.830770] Initializing USB Mass Storage driver... [605703.831288] scsi10 : usb-storage 2-5:1.0 [605703.831626] usbcore: registered new interface driver usb-storage [605703.831632] USB Mass Storage support registered. [605719.251982] scsi 10:0:0:0: Direct-Access WDC WD30 EZRX-00MMMB0 80.0 PQ: 0 ANSI: 2 [605719.254314] sd 10:0:0:0: Attached scsi generic sg2 type 0 [605719.258115] sd 10:0:0:0: [sdc] 1565565869 512-byte logical blocks: (801 GB/746 GiB)
See how internally there's 5,860,533,168 logical blocks and externally only 1,565,565,869.
I also noticed that SATA reports WDC WD30EZRX-00M 80.0 PQ: 0 ANSI: 5 while USB reports WDC WD30 EZRX-00MMMB0 80.0 PQ: 0 ANSI: 2 What's the difference between the two? Could this be the problem?
When connected to the SATA controller, parted says:
Model: ATA WDC WD30EZRX-00M (scsi) Disk /dev/sdb: 3001GB Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 1 1049kB 3001GB 3001GB xfs
How can I access the whole drive when it's in the enclosure? Do I need an updated kernel/driver?