Defining Disk Space
July 13th, 2009
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A comparison of usable drive space to physical disk drive capacity.
Overview: There are two main factors affecting your total system storage capacity:
- RAID Overhead
- Conversion between Binary and Decimal Byte “Equivalents”
In some cases, the overhead is 50% of the total hard drive capacity.
Comparing Binary and Decimal Equivalents:
The following Table charts common Binary/Decimal Values:
RAID Overhead:
With Raid 1 (Mirror) or Raid 5 (Strip Set with Parity), a certain portion of the disk space will be used for redundancy thus it will not show up as usable space.
Example of NAS 6000 Capacity Calculations:
The NAS 6000 base unit has twelve 160 GB hard…