MacBook Pro & Samsung 850 EVO

I've just had HDD replaced for the same SSD (850 EVO 250G). enable TRIM after you've finished restoring OS X, but you need codes to enable it in Terminal.

 

1 - If you're running Yosemite there are issues with running Trim Enabler. I quit using it as I preferred the better security. If you decide to use it read the instructions very carefully.

2 - Yes

3 - The drive is a user replaceable part. However Apple will not warranty the replacement drive nor any damage you cause making the swap like damaging the SATA cable.

I prefer to make a clone of the existing drive to the SSD in an external enclosure, boot from it to verify operation, then install the new drive in the machine. If there is a drive problem you don't have to make the swap multiple times. I use CCC to make the clone.

 

Trim Enabler modifies the disk drive kext. Yosemite requires kexts to be signed. You have to turn off kext signing for it to work. If you do an OS upgrade and signing is turned off, it's a pain to get it working. See this article for more info.

 

- The handy app Trim Enabler will do everything for you in order to enable TRIM.
But as mentioned, be sure to read the instructions and support articles to properly understand what you're doing and which potential issues you could be facing.

Running TRIM wisely on Yosemite requires some technical know-how. I've been running it without issues, but you should be aware of what it means before enabling it.

- The built-in Disk Utility can do that with its "Restore" function. Either run it from within OS X itself or boot into Recovery Mode (Cmd+R on boot) and do it from there.

 

Hi guys, long time reader, first time poster

I've recently bought a samsung 850 evo as well. Couldn't resist the allure. I have an early 2011 MBP, running mavericks (on HD & SSD).

I ended up doing a clean install from a bootable USB (With Mavericks) and booting it externally via USB (2.0). Worked like a dream.

So I open it up, take out the old HD (which still works okay) and install the SSD. I reset the PRAM and SCM for good measure. Immediately it starts hanging and beach balling.

This is a real head scratcher, from what I've read it sounds like my SATA cable is broken, but my HD still works alright. If anyone could give me some pointers I'd really appreciate it!

 

If the old HDD is only SATA 2, it would have a slower link speed. That could explain why it works and the newer SATA 3 drive doesn't.

 

A SATA III drive will work just fine on a SATA II interface, it's just that the drive will only work at SATA II speed.

 

I've really been considering in getting the 1TB 850 Evo for my Mid-2012 Macbook pro, but are you saying that it will only run on SATA II speeds instead of 3? If so then can I get one of those Apricorn Sata 3 slots or something?

 

Not at all. The mid-2012 MBP has SATA III so you'll get full speed out of your SSD.

 

- Yes, turn TRIM off and kext signing back on prior to any OS X updates and before resetting SMC or NVRAM. TE will remind you to enable TRIM each time you boot without it if you select that option in its preferences.

That should keep you pretty much error-free. I haven't even needed to disable it before OS updates, but others have. So to make sure, you should disable it.

 

If the SATA cable isn't working properly, a 3.0Gb/s negotiated link speed may work while a 6.0Gb/s link speed may not. A SATA II drive may work and a SATA III drive won't.

 

Thanks for the info. Do you have an SSD or the 850 evo installed by any chance? Just wanted some feedback since i've never used an SSD before and want to make sure I get a decent once for my Pro.

 

I've got a 1 TB 850 Pro, it's been an amazing drive so far. I had it in my mid-2010 MacBook before I got my MBP and it still performed well even though that computer had SATA II.

 

I recently installed a 500GB Samsung 850 Evo into my sisters 2012 13" MacBook Pro. It works perfectly. When I tested it using the Blackmagic Disk Speed test, I saw 500-sh MB/s read/write speeds.

 

Hi thanks for input, I just read a couple more sources suggesting similarly that the SSD demands more from a SATA cable. I'll try replacing it and see how I go

 

- Yes, it takes care of absolutely everything. Including turning kext signing back on when you disable TRIM.

 

I installed a Samsung 850 Evo 1TB SSD in my MacBook Pro 2012. I used Disk Utility instead of SuperDuper to clone Mavericks to the SSD because it can copy the Recovery HD partition which SuperDuper currently cannot do. After the installation was done I turned on the MacBook Pro, installed Chameleon SSD Optimizer and turned on Sleep Mode, Disable Sleep Image, and TRIM for the SSD. Rebooted twice and verified that TRIM was enabled in System Information. So far so good.

 

Was just wondering about a possible update. Since you haven't said differently, I'm assuming that you haven't had any issues since your original post. My fiancée and I have decided to upgrade the drive in her 2012 MBP, and I was looking at the 850 Evo 500GB, but some people have reported issues, while others (like yourself) seem to have no problems at all. Did you have to replace the SATA cable at all, or just setup the drive and swap it?

 

Hi

After all, what did you decide about TRIM support application?

 

It is no longer needed.

See here:

http://www.macrumors.com/2015/07/01/os-x-trim-ssd/