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SET, BOOTBLOCK, Qualifier, /BLOCK_SIZE
 *Conan The Librarian 

       /BLOCK_SIZE=512 (default)
       /BLOCK_SIZE=2048

    Specifies the target block size for the bootstrap device, in
    bytes.

    The 512-byte block size applies for most disk devices. The 2048-
    byte block size typically is used only when writing the boot
    block to specific OpenVMS Integrity servers CD and DVD devices.
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