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solid state drive (SSD) capacity

Definition

solid state drive (SSD) capacity

SSD capacity is the maximum amount or data that can be stored on a solid state drive.

According to JEDEC, SSD capacity should be defined as user-addressable capacity and not include non-volatile memory areas intended for the flash controller's use. JEDEC recommends that SSD capacity be calculated using the following formulas:

For a logical block size of 512 bytes:

User-addressable logical block count = 21168 + (1953504 x SSD Capacity in GBs); or

SSD Capacity in GBs = (User-addressable logical block count - 21168) / 1953504.

For a logical block size of 4096 bytes:

User-addressable logical block count = 2646 + (244188 x Capacity in GBs); or

Capacity in GBs= (User-addressable logical block count -2646) / 244188

Related glossary terms: stand-alone solid state storage (SSS), solid state module (SSM), RAM-based solid state drive (SSD), client solid state drive (SSD), queue depth, Fast Guide to RAM, semiconductor fab, flash cache appliance, floating gate, tunnel injection

This was last updated in January 2012

Posted by: Margaret Rouse

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