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This is primarily useful to do something like "loopback newdev (dev)8+" to create a device that skips the first 4 KiB, which may contain a container header, e.g. a non-standard RAID1 header, that GRUB does not recognize. This would allow that container data to be potentially accessed up to the end of container, which may be necessary for some layouts that store data at the end. There is currently not a good way to programmatically get the number of sectors on a disk to set the appropriate length of the blocklist. Signed-off-by: Glenn Washburn <development@efficientek.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>