What all of this comes down to is which type of TRIM command your hardware is capable of executing. (RZAT): All read commands to the LBA after a TRIM shall return zero. (DRAT): All read commands to the LBA after a TRIM shall return the (LBA) after a TRIM may return different data. Non-deterministic TRIM: Each read command to the Logical block address.Returned from an ATA IDENTIFY DEVICE command: There are different types of TRIM defined by SATA Words 69 and 169 Introduced a queued TRIM command to remedy this. Normal workload of queued read and write operations.

Within the TRIM specification, included in SATA 3.1,Ī drawback of the original ATA TRIM command is that it was defined asĪ non-queueable command and therefore could not easily be mixed with a

Keep in mind that the SATA 3.1 spec which addressed the TRIM issues wasn't released until July of 2011 The conference where this paper was presented was in Feb of 2011. Since I was the author of the answer linked, I'll have a go at explaining what's going on.įirst off, it's important to note that the study FAST referenced from the SE Information Security community, Reliably Erasing Data From Flash-Based Solid State Drives is from 2011 and now 6 years old 1.

Enable trim mac os sierra sandisk