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(grub.info)map

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map
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 - Command: map to_drive from_drive
     Map the drive FROM_DRIVE to the drive TO_DRIVE. This is necessary
     when you chain-load some operating systems, such as DOS, if such
     an OS resides at a non-first drive. Here is an example:

          grub> map (hd0) (hd1)
          grub> map (hd1) (hd0)

     The example exchanges the order between the first hard disk and the
     second hard disk. See also Note: DOS/Windows.