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With OS X 10.6 I had massive problems with an SSD – it became slower and slower with each day. At the end I replaced it with a classical hard disk and it was quite fast again.

Now I want to know if at least OS X 10.7 supports TRIM to prevent SSD performance decreasing over time?

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  • Everything I've seen shows Lion supporting TRIM for Apple SSDs, but I have yet to see any screenshot or other evidence showing TRIM enabled on a non-Apple supplied SSD. I would LOVE to see one since I'm hoping to buy an SSD to give new life to my macbook pro. Jul 20, 2011 at 17:34
  • I believe it's only Intel SSDs but don't quote me on that Jul 20, 2011 at 17:57
  • BTW, I was using a Super Talent Masterdrive SX, which is working fine now on Windows 7 (which has TRIM support).
    – Mike L.
    Jul 21, 2011 at 19:07

3 Answers 3

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From what I've seen, official TRIM support is limited to Apple-supplied SSDs, but Trim Enabler still works. (Reference Discussion)

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  • No TRIM for me on an Apple SSD after upgrading: apple.stackexchange.com/questions/19949/… Aug 3, 2011 at 15:40
  • Perhaps they didn't go back and add TRIM support for all SSDs that didn't already have it. Actually, this is probably the case. Apple's never exactly been known for continued hardware support.
    – afrazier
    Aug 3, 2011 at 17:10
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Hmm, OS X Lion says no TRIM support for my OCZ Vertex2.

Thankfully this SSD controller has good garbage collection routines. Didn't notice a slowdown on OS X Snow Leopard (10.6), so I'm not too worried.

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  • Thank you Martijn, this is exactly the kind of evidence I was looking for. Unfortunate and silly, but useful. Jul 20, 2011 at 19:15
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Hi yes Lion does support TRIM, if you look at the link below you can see a post with evidence.

http://osxdaily.com/2011/02/25/mac-os-x-lion-supports-trim-for-ssds/

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  • That site shows you can check for TRIM Support under apple menu - About This Mac - More Info - System Report - Serial-ATA. When I tried this on a mid-2011 Mac Mini running OS X 10.7 and fitted with a 500GB SanDisk Ultra 3D SSD (SDSSDH3-500G-G25), it said "No" there is no TRIM support for that particular drive. Retailers do say this drive has Trim Command Support, so I think it just means 10.7 is refusing to do it on this (non-Apple) drive. But this drive does have a write cache, which I hope will keep it fast even without TRIM. Dec 4, 2020 at 23:08

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