Before you begin: enable AHCI (with TRIM)

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Judit Llordes
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Page 2: Before you begin: enable AHCI (with TRIM)

If you have installed the operating system in IDE mode, we recommend that you switch to AHCI following the instructions published by Microsoft at this address.



Verify that the TRIM command is enabled

It is then necessary to verify that the TRIM command is active, so that the operating system can send the relevant information to the SSD drive. To do this, type "cmd" in the Windows Start menu, without quotes. Then select the command and right click, and run it as administrator. On the command line that appears, type "fsutil behavior query DisableDeleteNotify", again without quotes. At this point if DisableDeleteNotify = 0, then TRIM is enabled, otherwise it is not if the value is equal to one.


According to the more common definition TRIM is an ATA command which allows the operating system to tell the SSD which blocks of data can be erased because they are no longer needed. In this way the drive, with controller and firmware, can manage "erasable" data with greater efficiency, and slowdowns during write operations are prevented. Without this command, in fact, every write command would have to be combined with a check of the available sectors, and would therefore be much slower. Furthermore, the lack of TRIM compatibility has been shown to be a direct cause of performance degradation over time



Once the test platform is configured, we can move on to the actual tests.

Samsung 840 EVO 120 GB Adata Premier Pro SP920 256 GB Samsung MZ-MTE250BW SSD 840 EVO 250GB OCZ Arc 100 SSD and 240GB
Before you begin: enable AHCI (with TRIM)

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