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(grub.info)Stage1 errors

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Errors reported by the Stage 1
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   The general way that the Stage 1 handles errors is to print an error
string and then halt. Pressing `<CTRL>-<ALT>-<DEL>' will reboot.

   The following is a comprehensive list of error messages for the
Stage 1:

Hard Disk Error
     The stage2 or stage1.5 is being read from a hard disk, and the
     attempt to determine the size and geometry of the hard disk failed.

Floppy Error
     The stage2 or stage1.5 is being read from a floppy disk, and the
     attempt to determine the size and geometry of the floppy disk
     failed. It's listed as a separate error since the probe sequence
     is different than for hard disks.

Read Error
     A disk read error happened while trying to read the stage2 or
     stage1.5.

Geom Error
     The location of the stage2 or stage1.5 is not in the portion of
     the disk supported directly by the BIOS read calls.  This could
     occur because the BIOS translated geometry has been changed by the
     user or the disk is moved to another machine or controller after
     installation, or GRUB was not installed using itself (if it was,
     the Stage 2 version of this error would have been seen during that
     process and it would not have completed the install).