Knowledgebase: SSD
Why does my SSD drive show up as less capacity than what I paid for?
Posted by Jakob Kristensen on 27 June 2010 09:44 PM
The “missing” disk space in all SSDs, USB pen drives, and all flash products in general is used for a number of things;
controller firmware, block information, and spare blocks to replace worn out blocks in the drive.
The spare blocks allow the drive to extend its lifetime, maintain data integrity, and maintain its performance much longer than it would be able to without these spare blocks.

The issue of missing storage space applies to all flash based products regardless of type and manufacturer. For some devices the loss of storage may be as low as 4% while for others it may be up to 7-8%. The size depends on many factors, including controller type, firmware version etc.
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