Promise Technology FASTTRAK SX4300 - Manual (Page 55)

Chapter 5: Concepts
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Multiply the number of blocks by the sector size to find the capacity of a logical
drive:
4,000,000,000 blocks x 512 bytes per sector = 2,048,000,000,000 bytes
of data for a 2TB drive.
Note that you cannot change the size of the sectors nor can you increase the
number of address blocks above 4 billiion.
As a result, there are range limits imposed upon logical drive expansion as
shown in the table above. For example:
• You can expand a 2.5 TB logical drive up to 4 TB
• You can only expand a 1.9 TB logical drive up to 2 TB
See the table below.
You can direct WebPAM PRO or the CLU to expand a logical drive beyond the
maximum expansion size. However, when expansion is finished, your logical
drive will be the maximum size listed in the table.
If you require a logical drive larger than the maximum expansion size:
1. Backup the data from the current logical drive.
2. Delete the current logical drive.
3. Create a new logical drive with the desired capacity.
4. Restore the data to the new logical drive.
Current LD Size
Maximum LD
Expansion Size
Sector Size
8 to 16 TB 16 TB 4096 bytes
4 to 8 TB 8 TB 2048 bytes
2 to 4 TB 4 TB 1024 bytes
0 to 2 TB 2 TB 512 bytes
Caution
Before you begin logical drive Expansion or RAID Level Migration,
always back up your important data.