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Enable trim support on Apple and third party SSD’s
Authored by: Andrew J Freyer on Mar 29, '11 08:53:31AM

I have the same complaint regarding independent verification that TRIM is enabled, but here's what made me confident:

I have two SSDs in my MBP and only one is showing TRIM support in system profiler after the ktext update - a Kensington SSD that supports TRIM. The other drive is older and does not.

Anecdotally, clearing my trash on my TRIM SSD of nearly 3GB was shockingly fast. Much faster than before I enabled TRIM. This is expected behavior on a TRIM-enabled drive.

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Enable trim support on Apple and third party SSD’s
Authored by: chucky23 on Mar 29, '11 09:22:43AM

"I have two SSDs in my MBP and only one is showing TRIM support in system profiler after the ktext update - a Kensington SSD that supports TRIM. The other drive is older and does not."

That does seem to add weight to the case that this actually does enable TRIM.

But it could also just be an artifact created by the drives indicating to System Profiler whether they support TRIM or not.

I'm still confused that there would be no way of actually testing that TRIM is enabled by running some software tool that wrote something to the drive, deleted it, and then looked at the drive...



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Enable trim support on Apple and third party SSD’s
Authored by: Andrew J Freyer on Mar 29, '11 09:25:11AM

Before modifying, both drives indicated that TRIM was not enabled.

I do not think that this is merely an SSD reporting patch. Perhaps anecdotal evidence is all we're going to have in this particular circumstance.

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Enable trim support on Apple and third party SSD’s
Authored by: chucky23 on Mar 29, '11 10:12:48AM

"Perhaps anecdotal evidence is all we're going to have in this particular circumstance."

That's what confuses me. I'm unclear on why there would be no way of testing TRIM at the disk level.



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Enable trim support on Apple and third party SSD’s
Authored by: chucky23 on Mar 29, '11 12:24:58PM

"Perhaps anecdotal evidence is all we're going to have in this particular circumstance."

One guy claims to have checked via using a Ubuntu CD and multiple boots:

http://forum.hardmac.com/index.php?showtopic=10020&st=0&p=18069&#entry18069

But I'd love it if someone who knew how to directly check the sectors while booted into OS X would test the thing. It's got to be possible to check the disk sectors under OS X, and I don't fully trust the guy's experiment. (At a minimum, he should have tried the same test with the regular kernel extension to see if he got the opposite result.)

I've been keeping my SSD with 50% free space specifically because I knew TRIM was coming sometime in the future, and I'd love to fill that SSD up if someone could definitely verify that this was really working.



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