The System is unbootable

Lösung:

If you suspect that the boot block on the system disk is invalid, you can write a new boot block using the Writeboot utility WRITEBOOT).

The following actions might cause a boot block to become invalid:

• Modifying the primary bootstrap image with the SET FILE/MOVE command or the $MOVEFILE system service.
• Restoring a backup of the system disk created without the /IMAGE qualifier.
• Adding a new version of the primary bootstrap image, for example, during an operating system upgrade. (When the upgrade procedure adds a new version of the primary bootstrap image, it automatically uses WRITEBOOT to write a new boot block.)
• Adding a new version of the primary bootstrap image that is not contiguous on disk. (Use the DIRECTORY/FULL command to determine this.)

NOTE Instructions for using the WRITEBOOT utility are somewhat different on VAX and Alpha systems. Instructions for performing this task on VAX and Alpha systems follow. You must have LOG_IO privilege to use WRITEBOOT.