Library /sys$common/syshlp/EFI$HELP.HLB  —  Error Messages, PERILCLUS
 cluster count within 16 clusters of required FAT format cut-over

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

    Explanation: The specified FAT volume has a valid format, though
    the count of clusters is within 16 clusters of a required cut-
    over to the next larger or next smaller FAT format. Per EFI FAT
    specifications, this condition can cause instability when this
    volume is accessed from certain erronously-coded FAT utilities.
    All FAT12 volumes must have fewer than 4085 clusters, all FAT16
    volumes must have between 4085 and 65524 clusters inclusive, and
    all FAT32 volumes must have at least 65525 clusters. This volume
    is perilously close to one of these cluster count cut-overs.

    User Action: While no action is specifically required, the EFI
    FAT specifications do recommend reinitializing the volume with a
    new cluster size, and specifically with a cluster size calculated
    to avoid a cluster count in proximity to one of the FAT format
    cut-overs.
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