Reserved cluster

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

    Explanation: an attempt to operate on a reserved storage cluster
    has occured. This can indicate a volume structure error, or a
    volume structure corruption, or an internal error.

    User Action: If this condition is not a result of a corrupted
    FAT volume structure or media error and can be reproduced, please
    contact the support center.