I've successfully used qvm-block (in Dom0) to attach USB drives to different 
VMs (persistently), but I've noticed that Qubes (or Linux) sometimes gives them 
to different devices over time. In other words, on Monday, my BIG_TOSHIBA drive 
will be on /dev/sda, but it'll be assigned to /dev/sdj when I boot up on 
Wednesday. This is throwing off my VeraCrypt / FreeFileSync backup routine. 
(Another way of saying this is if I say "qvm-block attach MyVM sys-usb:sda 
--persistent" when one of the three drives I use for MyVM is currently attached 
to that, this will fail if Qubes moves that drive to a different device-name 
(during boot) that isn't one of the three I previously attached (when I go to 
start up that VM).

I thought about persistently attaching all 10 of my USB drives to the VM (some 
HDs, some flash, one SSD - I never use all of them at once - don't ask!) 
because that would certainly fix this problem, but I get the following error 
when I try to start the VM: "ERROR: Start failed: XML error: target 'xvdi' 
duplicated for disk sources '/dev/sdc' and '/dev/sde', see 
/var/log/libvirt/libxl/libxl-driver.log for details".

Note that I did all the persistent attachment commands while the VM was not 
running. If I detach all those, start the VM, do the persistent attachments, 
shut down the VM and then restart it, I get an error along the lines of "qrexec 
process failed to respond in 60 seconds".

So, I guess I'm asking if there's a way to just persistently attach 2 or 3 
external USB drives and have them consistently available on the same device 
names when I start the VM so VeraCrypt doesn't balk?  (VeraCrypt ultimately 
doesn't care what device a drive is attached to (it could be sda - sdj on my 
system) because it shows the attached drive as "/media/user/BIG_TOSHIBA, but if 
a drive isn't where it's supposed to be, that'll fail.

In case you're curious, the error messages in 
/var/log/libvirt/libxl/libxl-driver.log are meaningless to me, but if you want 
me to post it, I can.

Any help you guys can give me would be greatly appreciated! Thanks...

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