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bbotte

macrumors 65816
Original poster
Feb 11, 2008
1,196
21
USA
I have an Apple SSD, why don't I have TRIM support? Can I enable it somehow?
 

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KPOM

macrumors P6
Oct 23, 2010
16,033
4,803
Back in 2008, not many SSDs supported TRIM. It requires hardware as well as software support.
 
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bbotte

macrumors 65816
Original poster
Feb 11, 2008
1,196
21
USA
But I thought TRIM works with all the SSD MacBook Airs in Lion? If not where is the cutoff? 2010?
 
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KPOM

macrumors P6
Oct 23, 2010
16,033
4,803
Perhaps some of the later 2009 model SSDs would work with TRIM. I had a Rev B with the SSD, and when I switched to the Rev D last year, I noticed a BIG performance difference. SSD technology changed rapidly between 2008 and 2010. It didn't become standard on the MacBook Air until 2010, so that may be why there is confusion as to which SSDs are compatible.
 
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WardC

macrumors 68030
Oct 17, 2007
2,726
213
Fort Worth, TX
I would believe this might have something to do with the older SSDs being PATA and the newer SSDs being SATA. The Toshiba SSDs that are used in the MacBook Pros all support TRIM. The SSDs in the iMacs (BTO option) are Toshiba and support TRIM as well. The Blade SSDs in the Rev D and the new 2011 are also Toshibas and SATA-based and support TRIM.

The older SSDs used in the RevB and RevC MacBook Airs were NOT Toshiba and they were NOT SATA II as I understand, and this leads me to believe that this is the reason they don't support TRIM.
 
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