attempt to write to or to erase [000000]GPT.SYS failed

    Facility: EFI$CP, The OpenVMS EFI Partition Control Program

    Explanation: GPT.SYS is present, but is apparently ill-formed or
    ill-sized.

    User Action: Use the DCL commands DIRECTORY and DUMP to determine
    if the file is present, if the file is writable, and if storage
    is allocated to all blocks of the file. In particular, use
    DUMP/BLOCK=START=lastblock to dump the last allocated block of
    the file. (If this dump of the last block fails, the GPT.SYS
    file likely overhangs the end of the disk, and you cannot use GPT
    bootstrap structures with this disk. You must either select and
    use MBR-only operations or you must reinitialize the entire disk
    with a valid GPT and reload the files.)