Samsung T5 External SSD - Is TRIM supported on Mac OS Sierra?

Discussion in 'Mac Accessories' started by rsg1010, May 22, 2018.

  1. rsg1010 macrumors member

    Joined:
    Jan 8, 2014
    #1
    Hey everyone,

    I'm looking at buying a Samsung T5 External SSD and was curious to know if anyone who owns one can verify if TRIM is supported? I believe it is on a Windows OS but I'm unsure on Mac OS Sierra.

    Thanks
     
  2. Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #2
    Chances are, TRIM isn't supported.

    BUT... don't worry about it.
    TRIM will make next-to-no difference at all. It's one of those issues that is "lots of smoke but no fire".

    I've been booting and running a 2012 Mac Mini for almost 6 years using an SSD in a USB3/SATA dock. The lack of TRIM has never been an issue ... NEVER.
    Having said that, I keep plenty of free space on the SSD, so the OS has "room to breathe".
     
  3. rsg1010 thread starter macrumors member

    Joined:
    Jan 8, 2014
    #3
    Thanks for the reply. What storage is your SSD and how much free space do you generally keep available? I'm looking at the 500 GB model of the Samsung T5 so curious to know how much room I should try to keep available. Thanks
     
  4. satinsilverem2 macrumors 6502a

    satinsilverem2

    Joined:
    Nov 12, 2013
    Location:
    Richmond, VA
    #4
    TRIM is supported in HS but you can't send SATA commands like trim over USB as far as I know. its also not really needed anymore as modern SSDs have garbage collection built in so you can have that thing packed all the way full without issue. thats what I've done for years now without a single issue.
     
  5. SaSaSushi macrumors 68040

    SaSaSushi

    Joined:
    Aug 8, 2007
    Location:
    Takamatsu, Japan
    #5
    Irresponsible and oft-repeated misinformation based entirely on one user's own circumstantial experience.

    When that problem-free SSD he keeps basing this declaration of TRIM's irrelevance on does eventually die it may have been twice as fast as it would have in a TRIM-enabled machine.

    No, TRIM does not work over USB in macOS and yes, TRIM absolutely does make a difference in performance and significantly reduces write amplification.

    The lifetime of an SSD is calculated in write cycles.
     
  6. Fishrrman, May 28, 2018
    Last edited: May 28, 2018

    Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #6
    No. TRIM DOES NOT matter that much any more.
    It's Sushi's "advice" that is misinformation.
    I stand by this post.

    An open request to anyone reading this that is currently booting and running an iMac or Mini via USB:
    Has the lack of TRIM mattered much for you?
    If so, have you been able to document the information?

    I say to Sushi:
    Put up, or shut up.
    Produce documented info if you have it.

    For someone with an older Mac (2012-2015), who has only a platter-based hard drive inside, and who wants to "squeeze more years of use" from it, adding an external USB3 SSD is a cost-effective solution. No breaking open the machine, no risk of breaking something inside.

    It will greatly speed up the computer, and so long as the user leaves a good amount of free space on the SSD, it will probably continue to perform well long enough to "outlive" the computer itself.
     
  7. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #7
    Here was my reply to your demand almost a year ago. If you like, I can find other posts with more examples.

    I understand you have not had any issues running without TRIM, but some users do.

     
  8. rsg1010 thread starter macrumors member

    Joined:
    Jan 8, 2014
    #8
    I'm curious if anyone can shed some light on this:

    1) Why/How does Windows support trim on this particular SSD external drive (Samsung T5) over usb compared to Mac OS? Is the limitation of TRIM predominately based on the OS rather then the physical connection of the drive being used?

    2) What if I am using Parallels (Windows 10) in conjunction with With Mac OS Sierra via USB-C. Would TRIM work when Parallels is running? Or how about using a windows 10 desktop and also a 2016 Mabook Pro. IF I am going back and forth between different computers, does trim work when connected to the windows 10 desktop?

    Thanks for the info everyone. Much appreciated!
     
  9. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #9
    It doesn't. Here is an older post of mine that explains a bit.

     
  10. rsg1010 thread starter macrumors member

    Joined:
    Jan 8, 2014
    #10
    Thanks for the info. Quick question. Is that Powershell Command run every time the SSD Drive is connected via USB to the computer or once only? Does it subsequently send the correct commands everytime when the SSD Drive is attached to that computer?

    Thanks
     
  11. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #11
    No... you would have to run it manually.
     
  12. Mr. Retrofire macrumors 603

    Mr. Retrofire

    Joined:
    Mar 2, 2010
    Location:
    www.emiliana.cl/en
    #12
    Garbage collection is an additional feature, while TRIM is a mandatory feature, especially for OS and applications disks (virtual memory).
     
  13. motrek macrumors 68020

    Joined:
    Sep 14, 2012
    #13
    Relying on garbage collection instead of TRIM is viable to some degree but not ideal. I bought a Mac Mini in 2012. I didn't want to go through the trouble of switching the internal drive to an SSD so I bought a 2.5" SSD and put it in an external enclosure and used that as my boot drive. It worked well for about 2 years but then I started experiencing horrible slowdowns if I wrote more than ~1GB to the drive over the course of a few minutes. Clearly I was exceeding the ability of the drive to free up empty blocks. It didn't happen often enough but the slowdowns were bad enough that I had to do something about it. (The system would hang for several seconds if it tried to write ANYTHING to the drive past ~1GB and it would stay like that for 15-30 minutes.) I bit the bullet and installed the drive internally, enabled TRIM, and that eliminated the slowdowns.
     

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