To remove the diagnostic partition on an OpenVMS I64 system disk and to recover the disk space occupied, delete the file SYS$MAINTENANCE:SYS$DIAGNOSTICS.SYS and then reset the boot block. This file can contain hardware diagnostics but is not essential for operations. To delete the file, enter the following command:

   $ DELETE SYS$MAINTENANCE:SYS$DIAGNOSTICS.SYS

Reset the boot block by entering the SET BOOTBLOCK command at the DCL prompt, as in the following example, where target-disk is the device on which your target system disk is mounted:

   $ SET BOOTBLOCK /PRESERVE=SIGNATURE target-disk:[VMS$COMMON.SYS$LDR]SYS$EFI.SYS