How to check TRIM status via Terminal

Interesting thread. I get "Yes" too.

Now on a different note, I have bumped into a couple of articles that suggest some SSDs don't play well with TRIM enabled.

Has anyone else heard about this? Here's two things I found today regarding this issue. I also would like to find a way to do a comparative test that would tell me if "reads" = what was written. (aka "writes")

Here's one article I found an an additional program that I can't really ascertain what it's function is. If anyone can contribute to this conversation please speak up. Thanks!

How to Enable TRIM for Third-Party SSDs on Mac OS X

linux/libata-core.c at e64f638483a21105c7ce330d543fa1f1c35b5bc7 · torvalds/linux · GitHub

I have an OCZ SSD (acquired by Toshiba) where the manufacturer cautions about using TRIM with the drive as they had already incorporated TRIM features into the drive controller. Just blatantly using TRIM on any SSD without some upfront reading can impact the reliability of the device, or worse.

Fatmac gave the correct command:

it will answer with:

TRIM support: Yes

or

TRIM support: No

for each disk, meaning that if you have two SSDs you will have two answers, one for each.

Note:

in early days the Trim command could cause trouble for the SSD controller and its WearLeveling/GarbageCollection controller, so it was not good to install the Trim command;

in modern SSD the Trim command is not read at all so On or Off is not relevant anymore.

Lexiepex wrote:

Note:

in early days the Trim command could cause trouble for the SSD controller and its WearLeveling/GarbageCollection controller, so it was not good to install the Trim command;

in modern SSD the Trim command is not read at all so On or Off is not relevant anymore.

So the question becomes at what date did SSDs become modern.

In terminal, try:

system_profiler SPSerialATADataType | grep 'TRIM'

That's odd because I get:

TRIM Support: No

before TRIM is enabled, and

TRIM Support: Yes

when it is enabled. Since your response suggests some connection with system profiler code, something else may be broken.

BTW, what's the capacity of your OWC Mercury Electra 3G SSD?

I was curious about the SSD's size because the 960GB drive is, or at least used to be two 480GB SSD's sandwiched together in a RAID configuration (that was my first SSD). It showed up in System Information as "Rotational." As such, TRIM couldn't be enabled because as far as the OS was concerned it wasn't necessary.😟

about 3 to 4 years ago.