Data Backup; Disk Write Protect - NEC N8151-74 User Manual

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Data Backup

This section describes the data backup procedure against an emergency.
Data backup in two DVD-RAM disks, or main and sub disks
For backup of important data or program, it is recommended to save the data or program
in two DVD-RAM disks, or the main and sub disks.
If a read error occurs due to dust covered on either of the DVD-RAM disks, the data can be
recovered from the other DVD-RAM disk to prevent the important data or program from
being lost.
Three-generation management of data
For the backup of the data on a disk, it is recommended to provide the three-generation
management for backup data.
Using three DVD-RAM disks, or A, B, and C disks, this method backs up the data in disk A
on the first day, the data in disk B on the second day and the data in disk C on the third
day and then the data in disks A, B, and C in the order.
If disk C causes a read error to occur, the correct data can be recovered by using the data
in disk B. If disk B causes a read error to occur, the correct data can be recovered by using
the data in disk A.

Disk Write Protect

If a DVD-RAM disk containing one or more important files is loaded in the Built-in
DVD-RAM drive, provide write protect for the disk. Then the files in the disk can be
protected if sudden power-off occurs due to a disaster or power interruption. In addition,
the measures can prevent the data from being lost by an incorrect operation.
For the write protect procedure, refer to the User's Guide of the attached Built-in
DVD-RAM Driver Software.