Skip navigation

Non-Apple SSD upgrade of MacBook Pro and trim enabling

5157 Views 17 Replies Latest reply: Dec 10, 2013 11:16 PM by babowa RSS
1 2 Previous Next
Omer Bugra Level 1 Level 1 (0 points)
Currently Being Moderated
Nov 1, 2013 10:47 AM



I have a question about non-Apple SSD upgrade of MacBook Pro. I was planning to go and buy an SSD in a couple of days but  I have coincidentally come up with a web page mentioning trim enabling to extend SSD life on MacBook Pros. Actually the article suggested that if trim is not enabled, the SSD performance degradation will start very quickly due to a high number of writing and deletion of data to the same location on the SSD. Apple's original SSDs are really expensive, I checked that. Is there anyone who upgraded with a non-Apple SSD and did not enable trim and realize the SSD performance degradation? Is there anyone who could easily enable trim and is using his Mac efficiently with a non-Apple SSD? I will be glad if you could share your experiences. I really want to improve the speed of my Mid 2012 13 inch MBP but I have to be sure before doing that. I am also planning to buy a Samsung Evo 840 250 GB SSD.


Regards and thanks in advance,



MacBook Pro (13-inch Mid 2012), OS X Mountain Lion (10.8.4)
  • ds store Level 7 Level 7 (30,305 points)

    Yes you need to install and run TRIM Enabler after your OS X is installed or reverse cloned onto the GUID/OSX  extended Journaled formatted SSD from a external boot clone drive of the previous internal drive.


    Also you need to run it after some OS X updates and of course upgrades, you'll notice the immediate performance drop if you don't.


    It's available over at, you'll have to right or control/alt key click to "Open" it to bypass OS X Gatekeeper.


    Read these user tips, you can clone your present internal drive to the new SSD using a SATA to USB adapter/Carbon Copy Cloner (not Superduper) and then reboot and hold option/alt key down on a wired keyboard to boot from it and test before making hardware switch.


    Make a bootable clone of your boot drive


    Upgrading Your MacBook Pro with a Solid State Drive


    Install/upgrade RAM or storage drive in Mac's



    Of your going the fresh install or + TimeMachine restore route, then also read this


    Reset your Mac

  • rfc143 Level 1 Level 1 (0 points)

    I'm no expert, but I've owned an 840 pro for almost a year (and done nothing to it except use it). On a lark I ran Black Magic and noticed dismal write performance (like less than 100 mbs), not that I noticed it that much in my day to day work. I did some reading and downloaded and ran TRIM Enabler from One word: WOW! It works. 325 write; 500+ read.

  • babowa Level 7 Level 7 (22,090 points)

    I purchased an SSD from OWC ( and their site states specifically that one should not and need not use TRIM enabler, so I have not. Have had the SSD for about a year without any problems.

  • Grant Bennet-Alder Level 8 Level 8 (48,110 points)

    In contrast, my son has had two different OWC SSDs in his laptop, without TRIM, and both have choked on deleted data and DIED.

    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
  • Grant Bennet-Alder Level 8 Level 8 (48,110 points)

    there were some models with garbage collection.

    ALL models have built-in Garbage collection -- it won't work without it.


    read this article about TRIM:


    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
  • babowa Level 7 Level 7 (22,090 points)

    This is the SSD I purchased:



    So far, there has been no degradation that I can tell and no, I have not done a speed test. And no, I would not be able to tell if there has been any battery improvement as I usually only run it on battery about 25 -   30% of the time (the rest of the time it is plugged in).


    @ Grant:


    interesting - which SSD models did he have?

  • Grant Bennet-Alder Level 8 Level 8 (48,110 points)

    Same as you -- 240Gb size

    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
  • babowa Level 7 Level 7 (22,090 points)

    Thanks; I'll file that away until/if I have a problem. As long as I'm covered by the warranty, I'm ok.

  • Grant Bennet-Alder Level 8 Level 8 (48,110 points)

    They replaced them under warranty.


    But it has made me an insufferable advocate of TRIM. Even for those drives.

    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
  • babowa Level 7 Level 7 (22,090 points)

    I wonder if I should drop a note to OWC and ask their opinion on the TRIM  Enabler; the one (and only) odd thing so far has been a necessary firmware update which I cannot use - it returns an error message which they could not even figure out and told me to simply ignore it until I had a problem.

  • Grant Bennet-Alder Level 8 Level 8 (48,110 points)

    Their position has always been that it is unnecessary.


    OWC has been a seller of Apple modifications (such as Processor upgrades) and add-ons for a long time. They even backed XPostFacto, a very interesting life-booster for running earlier versions of Mac OS X on older PowerPC Macs. They were unable to charge money for it, because it used Apple software in the process. They tried to monetize it by charging for their support forum for XPostFacto instead.


    They have been treading very close to the line of using Apple copyrighted software for making money for themselves. I expect Apple contacts them and "reminds" them not to cross that line on a regular basis.


    The current batch of third-party TRIM enablers patch the Apple Driver to recognize non-Apple drives as well as the already-supported Apple drives. In my opinion, it would be near impossible for OWC to recommend a solution like TRIM Enabler (which patches Apple software).


    In my opinion, OWC suggests their SSD drives "do not require" TRIM Enabler because they feel OWC as a company "do not require" Apple to sue them into bankruptcy.

    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
1 2 Previous Next


More Like This

  • Retrieving data ...

Bookmarked By (1)


  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.