User manual

Chapter 7: Technology Background
175
• Linux operating systems with the 2.6 kernel support 64-bit LBA. For these
OSes, always choose the default 512 B sector size.
See “Creating a Logical Drive” on page 74 or page 128, and “Creating a Disk
Array – Advanced Configuration” on page 125.
2 TB Limitation
If your Host PC runs Windows XP (32-bit), and you want to create logical drives
larger than 2 TB, you must choose a sector size larger than 512 B when you
create the logical drive. The table on the next page correlates sector size with
logical drive capacity.
Also see “Ranges of Disk Array Expansion” on page 178.
Initialization
Initialization is highly recommended for logical drives when they are created from
a disk array. Initialization sets all data bits in the logical drive to zero. The action
is useful because there may be residual data on the logical drives left behind
from earlier configurations. You can also perform an Initialization on an existing
logical drive.
There are two options for logical drive initialization:
• Quick – Overwrites the data bits on the first and last blocks of logical drive.
Takes only seconds.
• None – Not recommended.
Logical Drive Size Sector Size
8 to 16 TB 4096 bytes (4 KB)
4 to 8 TB 2048 bytes (2 KB)
2 to 4 TB 1024 bytes (1 KB)
0 to 2 TB 512 bytes (512 B)
Warning
When you initialize a logical drive, all the data the logical drive will
be lost. Backup any important data before you initialize a logical
drive.