XenCenter (6.6) Device Path shows a value of

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October 19, 2015 by aubreykloppers

If you find your disk ends up being <unknown> instead of mounted to a /dev/xvd? drive, open your console, do a
“xe vm-list” (Get your UUID)
“xe vdi-list” (Get the UUID of the disk you want to use)
“xe vbd-create vm-uuid=<UUID> device=1 vdi-uuid=<UUID> bootable=false mode=RW type=Disk
“xe vbd-list” (Get the UUID of the disk you want to use)
“xe vdb-plug uuid=<UUID>

I don’t know why this happens, but it does and drove me up the wall.  Some reading told me that it was due to an ISO not being unmounted.  Well, the above sorted it out and once the first disk was mounted, all the rest fell into place…