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Re: 3TB device that shows up as two devices

On Mon, Aug 20, 2012 at 10:56:30PM +0200, Thomas Klausner wrote:
> Hi!
> I've bought a Verbatim 3TB Store'n'Save USB hard disk.
> When I attach it, it gives me two devices:
> umass2: Verbatim USB 3.0 Desktop HD, rev 2.10/0.01, addr 4
> umass2: using SCSI over Bulk-Only
> scsibus2 at umass2: 2 targets, 2 luns per target
> sd5 at scsibus2 target 0 lun 0: <ST3000DM, 001-9YN166, CC4B> disk fixed
> sd5: fabricating a geometry
> sd5: 2047 GB, 2097151 cyl, 64 head, 32 sec, 512 bytes/sect x 4294965248 
> sectors
> sd5: fabricating a geometry
> sd6 at scsibus2 target 0 lun 1: <ST3000DM, 001-9YN166, CC4B> disk fixed
> sd6: fabricating a geometry
> sd6: 746 GB, 764437 cyl, 64 head, 32 sec, 512 bytes/sect x 1565567920 sectors
> sd6: fabricating a geometry
> Does anyone have a clue how to tell the hard disk to offer one 3TB partition 
> instead?

You'll have to ask Verbatim, this is done at the firmware level in
the USB/SATA bridge chip.  As there is no generic mechanism to
configure a USB Mass Storage Class device in such a way, you'll
need a probably-Windows-based utility to change it, if it's even

        Jonathan Kollasch

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