Out of curiosity, could you help me understand what you mean by
"unmapped"? How is this disk connected to the system (physically, SAN,
iSCSI, MPIO, etc.)?

Also, do you have the 'dd' command in use? I've used dd against disks in
the past and I usually try to check to see the disk is there first because
of the time 'dd' takes to read in the whole "file" (disk) otherwise.

Good luck.

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