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Is there a way of making a Linux block device which is just an offset into an existing block device?

i.e. /dev/sdo's block zero is /dev/sda's block 100, and /dev/sdo is consequently 100 blocks smaller than /dev/sda.

1 Answer 1

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man losetup:

   -o, --offset offset
          The data start is moved offset bytes into the specified file  or
          device.

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