[Qemu-devel] [Bug 686613] Re: USB MSD are not marked as removable

[Stefan Hajnoczi]

danpb has mentioned that Linux gets this information from SCSI INQUIRY
response.  So it's up to the USB Mass Storage Device to decide whether
or not it wants to have a removable medium.

The SCSI INQUIRY RMB (removable medium bit) tends to be set on modern
USB Mass Storage Devices.  Of course they don't actually have a
removable medium.

One side-effect of setting this bit is that Windows Auto-Run will work
if RMB=0 but not work if RMB=0.  Also, on RMB=1 devices only the first
partition is displayed by Windows - you can't have more than one
partition on the device.

For more information, see:
http://www.microsoft.com/whdc/connect/usb/usbfaq.mspx

So at the end of the day, it's up to QEMU whether or not to mark USB
MSDs as having removable media.  Since modern devices tend to set RMB=1,
we probably should too.

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https://bugs.launchpad.net/bugs/686613

Title:
  USB MSD are not marked as removable

Status in QEMU:
  Confirmed

Bug description:
   Filed from Fedora bug: https://bugzilla.redhat.com/show_bug.cgi?id=589130

Guests can access USB Mass Storage Device, but fail to mark them as removable.