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[Qemu-devel] [Bug 686613] Re: USB MSD are not marked as removable
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [Bug 686613] Re: USB MSD are not marked as removable |
Date: |
Tue, 11 Jan 2011 10:07:08 -0000 |
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.