Toshiba Qosmio G35-AV650 Series User Manual page 279

If write caching is disabled, data is copied from the
computer's hard disk to the secondary internal hard disk
one piece at a time.
If write caching is enabled, data is copied from the
computer's hard disk to a temporary storage area (write
cache). Then, the data is sorted and written to the
secondary internal hard disk.
The hard disk drive's performance improves when write
cache is enabled.
MBR Protection—Protects the master boot record on
your computer's hard disk by prohibiting data from being
written onto the master boot record data area.
The master boot record is a special data area on the
computer's hard disk which is read whenever the
operating system is started.
It is recommended that you enable MBR Protection. If the
master boot record of the primary internal hard disk is lost or
damaged, the operating system is unable to start. This would
result in data loss and your hard drive would need to be
rebuilt.
Contact a Toshiba Authorized Service Provider or Toshiba
Global Support Centre for assistance. Within the United States
call (800) 457-7777. Outside of the United States call (949)
859-4273.
MBR Protection can only be enabled if the RAID-1 array is
NOTE
designated as the boot drive.
Using the RAID-0 or RAID-1 Utility
Toshiba RAID Console Utility
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