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"fsck.ext2: Device or Resource busy while trying to open /dev/sdb" "Filesystem mounted or opened exclusively by another program?"

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So, what is your question? – Sven Jun 14 '11 at 11:40
did you forget to append a number for the partition you want to use? – wullxz Jun 14 '11 at 11:59

What's the output of lsof run with root privileges? Are you trying to use the partition or the device, as you may get errors if you don't mount the proper partition...

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