Haven't enabled TRIM on my SSD. The damage is irreversible?

othiagogarcia

macrumors newbie
Original poster
Oct 31, 2015
1
0
I’ve upgraded my Mackbook Pro Mid-2012 about almost 2 months ago. I bought a 16Gb RAM and an Samsung 850 Pro 256Gb SSD, but I haven't enabled the TRIM function until today. In the meantime, I’ve written a lot of data in the SSD and then deleted them (I even upgraded the OS X for the new El Capitan) and noticed that he is using much more RAM now for performing even simple tasks.

Today, I've enabled TRIM and I want to format the disk to perform a clean install of the new OS X El Capitan.

I just want to know one thing: By doing this (with the TRIM enabled now, of course), the damages that the SSD may have suffered will be restored? Or the damage is irreversible?

Thank you for all your help!
 

chrfr

macrumors G3
Jul 11, 2009
8,197
2,526
I just want to know one thing: By doing this (with the TRIM enabled now, of course), the damages that the SSD may have suffered will be restored? Or the damage is irreversible?

Thank you for all your help!
You have no reason to be concerned. It'll work fine for a long time.
 

Shirasaki

macrumors G3
May 16, 2015
9,429
3,443
Damage is irreversible of course. But you don't need to worry about that that much. Now SSD, even using TLC, can still last quite a long time before reaching its end of life.
 

hwojtek

macrumors 65816
Jan 26, 2008
1,133
238
Poznan, Poland
I’ve upgraded my Mackbook Pro Mid-2012 about almost 2 months ago. I bought a 16Gb RAM and an Samsung 850 Pro 256Gb SSD, but I haven't enabled the TRIM function until today. In the meantime, I’ve written a lot of data in the SSD and then deleted them (I even upgraded the OS X for the new El Capitan) and noticed that he is using much more RAM now for performing even simple tasks.
RAM usage has nothing to do with TRIM. You may enable it at any time you want and it will do what it should do from this point on, taking care of the SSD cells already damaged, should there be any. However, unless you're talking tens (or even more) terabytes of data, your SSD is perfectly OK.

Today, I've enabled TRIM and I want to format the disk to perform a clean install of the new OS X El Capitan.
Once you clean install OS X you will have to enable TRIM again anyway. The SSD only supports TRIM, but it's the OS job to issue this command. By default OS X does not issue TRIM command if installed on non-Apple SSDs, which is the reason for "force-enabling" TRIM. If you force trim by typing sudo trimforce enable into the Terminal, and subsequently format the SSD and clean install, you will need to enable TRIM again. Your scenario doesn't make any sense. Leave it as is with TRIM enabled, do not reinstall and enjoy your SSD.
 
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broadbean

macrumors 6502a
Jun 10, 2007
775
325
My understanding is that TRIM and garbage collection mainly affects how deleted files are treated on the SSD. ie if you have files on the SSD already that are not deleted, they're fine. So enabling TRIM after you've installed the OS and moved files across is also fine. That's how I read it anyway.