Qualifier

/BLOCK_SIZE
      /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.


/I64
   Specifies OpenVMS Integrity servers as the target architecture
   for the boot block. The default boot file for OpenVMS Integrity
   servers is SYS$SYSROOT:[SYS$LDR]SYS$EFI.SYS.


/PRESERVE
      /PRESERVE=keyword
      /PRESERVE=SIGNATURE

   /PRESERVE=SIGNATURE maintains the existing GUID disk signature
   value. The default is to generate a new signature for the target
   volume.

   SIGNATURE is the only keyword currently supported.