Toshiba G35 User Manual

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5.375 x 8.375 ver 2.3

RAID-1 improves reliability in storing data by automatically 
copying all data from your computer’s primary internal hard 
disk to your computer’s secondary internal hard disk. 

If your computer’s primary hard disk fails, you can replace 
the failed primary hard disk with the secondary hard disk that 
contains the mirrored data. See 

RAID-1 is configured by creating an array which specifies 
the hard disk to be copied, and the hard disk to which the data 
will be copied. For your computer, an array will consist of the 
computer’s primary internal hard disk and the computer’s 
secondary internal hard disk.

The process of copying data from the primary hard disk to the 
secondary hard disk is referred to as mirroring, and the array 
itself is referred to as a mirror. If you want to discontinue the 
process of mirroring, this is referred to as breaking a mirror. 
For more information, see 

. 

If both hard disk drives fail simultaneously, such as during a 
power failure, the mirrored data on the secondary hard disk 
may not be identical to the data on the primary hard disk.

To create a RAID-1 array, you must use a secondary internal 
hard disk with a capacity equal to or greater than that of the 
computer’s primary internal hard disk. For example, if the 
primary internal hard disk is 40 GB, then the secondary 
internal hard disk must be 40 GB or greater.

When RAID-1 is configured, the operating system will 
display the smaller of the two hard disk drives defined in the 
array as the computer’s total hard disk capacity. For example, 
when a RAID-1 array is configured with one 40 GB hard disk 
drive and one 80 GB hard disk drive, the computer’s total