SSD, TRIM, and Yosemite

I have a mid-2010 MacBook Pro that is showing its age.  I decided a few weeks ago to perform an upgrade; to up the RAM from 4 to 8, and install an SSD, especially since the rave reviews I have read and the price drop over the last year or so.  This has led me to read many many reports about possible issues with 3rd party SSD and how Apple has decided to update Yosemite that will not allow TRIM function.  I'm curious is there anyone out there that can provide some real insight and knowledge.  I know that there is a hack to disable the settings so you can still use TRIM, but I also read that for some of the new SSD you really don't need it.  I don't know if that is true. And researching website after blog after message board, to hear both sides and I'm really up in the air.   I can't afford a new laptop, but also can't  afford to dump a couple hundred bucks into my current unit only to have it slow down over a short period of time, putting me back to square one.  Not to derail the thread before it gets going but also wanted to see what everyone's opiniin is for brand of SSD.  I'm leaning toward Samsung 850 evo but also like the comparable version of Crucial.  My unit only supports SATA II, so maybe there is a better bang for my buck since that limitation.

Here is an article from the OWC blog on TRIM:
http://blog.macsales.com/21641-with-an-owc-ssd-theres-no-need-for-trim
I found this question and answer at the bottom of the article about the speed issue. In the answer, it's noted that the limitation exists on all 6G drives on his computer. Does that mean all 6g drives or just their Mercury 6g drives? I don't know the answer to that, but from what it implies, it means any 6g drives.
Marko.P @ 4:42 am on December 26, 2014
As I finally installed OS X Yosemite on OWC SSD and I tested it for speed…
But what should be the speed (read/write) on my new SSD, because I tested it yesterday (with Blackmagic Disk Speed Test) and it shows only write: 110MB read: 135MB is it possible???
Reply
OWC Ben M @ 10:47 am on December 29, 2014
Those speeds are normal for a 6G SSD in your iMac. As mentioned in the compatibility section of the 240GB Mercury Electra 6G SSD, A 6G SSD will only run at SATA 1.0 (1.5G aka 150MB/s) on certain Macs. This is due to the Nvidia SATA controller found in these computers not being able to properly down clock a SATA 3.0 6G SSD to the expected SATA 2.0 3G your computer is capable of. This limitation exists on all 6G drives on your computer.
As I said, check your model identifier and check to see if it is affected. Not all models are affected by this. If your computer is one of the affected models, then you will have to decide on taking a chance on other 6g SSD brands. They may be fine, but I just don't know.
Please remember that I'm not trying to put down other brands or steer you to an OWC. It's what I have and I can't comment on other brands because I've not tried any.

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  • "Error Disk too Slow" Macbook Pro 2011 - Maverick and Yosemite - The Great Grand Mystery Unfolds!!!

    Hey everybody,
    Logic Pro X user here, have a late 2011 Macbook Pro, upgraded to 16gb of ram, 2.8ghz intel core i7, running latest version of Mavericks and more recently on a separate partition I tried Yosemite with a  clean install of only Logic Pro X.
    I use Apogee Quartet as my audio interface, I have a OWC Mercury Elite Firewire 800 external drive that I record to, all LPX files are on my internal drive.
    Before Mavericks I had 0 issues with this setup, no with just one sole drummer track, or one single audio or software track, I get the various disk too slow errors after a few seconds.
    I have tried reinstalling LPX, I tried a clean partition with nothing but Logic Pro on it (both Mavericks and Yosemite).
    I have reset my PRAM and used Apple Hardware diagnostics as well as memtest (i think it was called) and even reverted back to my old original RAM that came with the computer.  All hardware tests passed, I have verified and repaired disks from disk utility as well as from the recovery partition.
    I have worked with Apple a bit over the phone doing these things, I have also read just about every thread on this pervasive issue.  And its ruining my experience as a user.  I absolutely loved Logic on Mountain Lion, no issues whatsoever! I'm considering reverting back to it actually.
    On a side note I also have a HDMI Tv connected through the thunderbolt display, and a self powered USB hub that I connect my wireless mouse, iPhone cable and WD MY passport drive (which I only use for Time Machine).
    I'm basically at my wits end and open to anybodies suggestions, I even tried resting the SMC and several other things advised in these forums.
    I'm Stil under Apple Care and wondering if going into them is my only hope left.
    I find that garageband acts the same, but I have no other system issues! its so bizarre, performance on all other programs is totally fine, its only when I want to record that I get issues.
    For the record I do have some 3rd party VTS (Arturia V collection, EZ drummer 2 and AMplitube) but when I did the clean partition they weren't there and I still had the disk to slow error, so I'm not convinced its because of those.
    Also Since the partition I obviously have played with my storage but I still have 75 gas of space on the mavericks partition (out of 500gb ) and on Yosemite partition I have 125 gbs available and on my Firewire external drive I have about 150gb left on a 500gb drive, so I'm not convinced its a space issue either (especially since before Mavericks Mountain Lion seemed to work just fine.)
    HELP! Please help...I'm so exhausted trying to fix this on my own, and admittedly I've run to the end of my own capacity and don't know where to go from here.
    Thank you for any suggestions, sorry for the long post, and if I have left anything out please let me know, this is my first post.

    And yes I did upgrade my apogee drivers to the recent ones they just released.

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