Stupidly enabled TRIM on Yosemite without realising. Help.

Spudhead

macrumors member
Original poster
Jul 23, 2013
35
4
Hey guys, turned on TRIM in Yosemite without knowing there was an issue with this. So comes to turning on my late 2011 MacBook with Intel 520 SSD and Im greeted with the stop sign on screen and cant load into OSX.

I've tried a couple of old youtube videos with no success, about entering stuff into terminal in recovery mode. Only thing Im bothered about is some pictures on my MacBook that haven't been backed up yet. They're of my late dog that sadly passed recently and its the only things I have left of her.

Just want to somehow get those pictures back and I'll be happy. Are there any known fixes for this thing? Seems like a crappy move on Apples part to do this.

Help please :(
 

DeltaMac

macrumors G3
Jul 30, 2003
9,535
2,303
Delaware
...
So comes to turning on my late 2011 MacBook with Intel 520 SSD and Im greeted with the stop sign on screen and cant load into OSX.

I've tried ... entering stuff into terminal in recovery mode. Only thing Im bothered about is some pictures on my MacBook that haven't been backed up yet. ... Are there any known fixes for this thing?
...
I have done this several times, because I was doing some testing that required booting while trim was enabled. If you simply do a PRAM reset, you disable the boot. The terminal commands worked about half the time for me, with no real way to predict failure - except that the "prohibited" sign would seemingly laugh at my feeble attempts to try a work around.
If the terminal commands don't seem to work, then you can just restart to your recovery partition, and reinstall OS X. Do that by restarting while holding Command-R, then choose Reinstall OS X from the menu that appears.
That always gets the system working again, and you won't lose YOUR files and pictures.
 

RichardC300

macrumors 65816
Sep 27, 2012
1,230
95
Chapel Hill, NC
I have done this several times, because I was doing some testing that required booting while trim was enabled. If you simply do a PRAM reset, you disable the boot. The terminal commands worked about half the time for me, with no real way to predict failure - except that the "prohibited" sign would seemingly laugh at my feeble attempts to try a work around.
If the terminal commands don't seem to work, then you can just restart to your recovery partition, and reinstall OS X. Do that by restarting while holding Command-R, then choose Reinstall OS X from the menu that appears.
That always gets the system working again, and you won't lose YOUR files and pictures.
I've seen others say that you just disable TRIM Enabler and restore original kext signing before updates that require booting, but your post makes it seem that ANY rebooting will require disabling TE and restoring original kext. Are others just assuming that people never restart or shut down their Macs except for updates?
 

DeltaMac

macrumors G3
Jul 30, 2003
9,535
2,303
Delaware
I've seen others say that you just disable TRIM Enabler and restore original kext signing before updates that require booting, but your post makes it seem that ANY rebooting will require disabling TE and restoring original kext. Are others just assuming that people never restart or shut down their Macs except for updates?
It was not my intent to make my post appear to say that ANY reboot while TRIM is enabled would cause a problem. That is certainly not the case.
Just to make this clear - system updates that require a reboot of your Mac (not all require a reboot) - or resetting the PRAM during a restart - will probably not boot again without running the terminal commands, or even a reinstall of Yosemite. So - you have the recommendation that you should disable TRIM BEFORE you install any system update.

And - yes, I would be one of those who almost never shuts down, restarts fairly often, but never with a PRAM reset (not without thinking first :D ) Last time that I remember shutting down and leaving it off, is probably mid-October 2013, when I upgraded RAM and SSD.
 

RichardC300

macrumors 65816
Sep 27, 2012
1,230
95
Chapel Hill, NC
It was not my intent to make my post appear to say that ANY reboot while TRIM is enabled would cause a problem. That is certainly not the case.
Just to make this clear - system updates that require a reboot of your Mac (not all require a reboot) - or resetting the PRAM during a restart - will probably not boot again without running the terminal commands, or even a reinstall of Yosemite. So - you have the recommendation that you should disable TRIM BEFORE you install any system update.

And - yes, I would be one of those who almost never shuts down, restarts fairly often, but never with a PRAM reset (not without thinking first :D ) Last time that I remember shutting down and leaving it off, is probably mid-October 2013, when I upgraded RAM and SSD.
Thanks. All this kext signing stuff with Yosemite is really confusing (especially the OS X update procedure ... disable TE > reboot > install OS X update > reboot > enable TE > reboot?) and has me hesitant about getting an SSD for my early-2011 MBP. Cindori has been saying there's something in the works for TRIM and Yosemite, so I'm anxious to see what that is.
 

h9826790

macrumors G5
Apr 3, 2014
12,787
5,600
Hong Kong
especially the OS X update procedure ... disable TE > reboot > install OS X update > reboot > enable TE > reboot?
For you info, that's just a precaution, not a requirement.

I always update OSX (Yosemite) without disable TRIM, never run into any issue. TRIM will be disabled automatically after the update anyway.

you can upgrade the OS without think twice and without any problem. However, you have to re-enable TRIM manually by yourself after the update is true.
 

RichardC300

macrumors 65816
Sep 27, 2012
1,230
95
Chapel Hill, NC
For you info, that's just a precaution, not a requirement.

I always update OSX (Yosemite) without disable TRIM, never run into any issue. TRIM will be disabled automatically after the update anyway.

you can upgrade the OS without think twice and without any problem. However, you have to re-enable TRIM manually by yourself after the update is true.
Interesting. This goes against a lot of what I've been reading. If you successfully update OS X without disabling TRIM (and without reverting back to original kext signing), then what exactly is causing people to get those gray stop screens?
 

steve23094

macrumors 68030
Apr 23, 2013
2,621
1,333
For you info, that's just a precaution, not a requirement.

I always update OSX (Yosemite) without disable TRIM, never run into any issue. TRIM will be disabled automatically after the update anyway.

you can upgrade the OS without think twice and without any problem. However, you have to re-enable TRIM manually by yourself after the update is true.
Same here. I forgot to disable it last OS update and it didn't screw anything up. If I remember correctly it automatically disabled itself and then told me to re-enable on next boot.
 

iArch

macrumors regular
Oct 18, 2008
159
7
All Over
My case exactly, computer booted no problem I just had to manually re-enable Trim after the update was finished.
That's how it's been for me through a number of updates, too. In fact I'd never even given it any thought. Then the most recent update came along and borked my MBP upon reboot. It was a complete PITA.
 

KALLT

macrumors 601
Sep 23, 2008
4,922
3,004
Thanks. All this kext signing stuff with Yosemite is really confusing (especially the OS X update procedure ... disable TE > reboot > install OS X update > reboot > enable TE > reboot?) and has me hesitant about getting an SSD for my early-2011 MBP. Cindori has been saying there's something in the works for TRIM and Yosemite, so I'm anxious to see what that is.
Technically it would be: disable TR > reboot > update OS X > reboot > disable kext signing > reboot > enable TR > reboot. :p