Why read/write speed of SSD is less than declared?

Thursday, 28 May 2015 00:00

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Why read/write speed of SSD is less than declared?

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Many owners of solid-state drives have a reasonable question "Why declared in specifications read/write speed of solid-state drive is less than what they have in reality?" It could be caused by a number of reasons described below. But it has to be mentioned that usually maximum speed is mentioned in SSD specifications.

Possible causes

TRIM function is off or unavailable;
Driver is not supporting TRIM command;
AHCI mode is off in BIOS;
SSD connected to SATA II (3 GB/sec) instead of SATA III (6 GB/sec);
Disk is overfilled. It is recommended to leave at least 25% of free space;
SSD firmware has become old and the manufacturer specified the speed results for new firmware mention;
SSD is used for a long time and NAND Flash memory chips started degrading;

In addition, the results of many benchmark tests differ and it is related to application of different methods in testing solid-state drives. Difference in results of tests can even be observed when using different version of the same tool because software developers continuously improve the algorithms for testing solid-state drives.

Last modified on Thursday, 28 May 2015 14:08

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