Hyper-V passthrough USB - SCSI OK with WD, not with SAMSUNG

Can anyone help me with getting USB disks to show in the guest OS (W2008 R2).
I have been very successful with WD Passports, once I get rid of the WD software.
Now I have some SAMSUNG S2s and they seem very similar (the host OS thinks they are disk drives), but the guest OS does not allocate them as drives, just puts them in the USB devices....
The host OS can offline, online, format and so on.
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Carol ChisholmAsked:
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Carol ChisholmConnect With a Mentor Author Commented:
Guest OS is Windows 2008 R2. All are listed as removable hard disks in the host OS.

The problem it that Samsung on the S2 portable disks have remove the SATA part and made a direct USB interface, not a SATA to USB-

This means they show as unknown in the guest OS, though they lok identical to the WD (and SAMSUNG Story) in the host OS.

The Hyper-V connection seems to be very low level and not entirely related to what one sees in the GUI.

So for anyone else reading this: WD passport, Samsung Story : passthrough to SCSI works. Samsung S2 does not. It's a hardware thing.
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Carol ChisholmAuthor Commented:
looking at this further: in the host OS both devices are recognised as storage devices, but in the guest the WD is a storage device and the samsung is an unknown device.
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msmamjiCommented:
What is the guest OS Version and are you trying to get the USB disk as pass-through to the guest?
In the Host OS, the drives are listed as Hard Disk Drive or Removable storage? WD in the guest is listed as Hard Disk Drive or Removable storage?
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Carol ChisholmAuthor Commented:
I have also found that the Freecom Mobile Classic 500GB disks passthrough as unspecified devices.
The Seagate Expansion 1TB are recognised by the Hyper-V host as SCSI disks and are therefore useful
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