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Mid 2012 model, A1278 / 2.5 GHz i5 or 2.9 GHz i7 processor.

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Sudden shutdown after having replaced the SATA cable from the SSD

So, a couple of weeks ago my Macbook "died" and I gave it back to the store where I bought it to let them repair it. (authorized retail store in Germany, not Apple).

It took about 3 weeks and the problem was that the SATA cable to the SSD (Samsung SSD 250GB) was broken. So they replaced it and sent me back my Macbook. Apparently they also cleaned the inside of the Macbook, but that's about it.

Since then my Macbook had 2 sudden shutdowns with a message like:

https://support.apple.com/library/conten...

I don't remember if this was the exact message or something like it. Anyway, this didn't happen before the repair, ever.

In both cases it was after the device had been in use for a long time. But then again, I always have it turned on for a long time so this shouldn't be an issue. The Macbook would restart right after and boot normally just as nothing had happened. For me, this is still troubling and I would like to have it fixed. So, if you have any idea how I could solve this problem and if this could have anything to do with the SATA cable replacement, it would be great.

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This model tends to have problems with the SATA cable. So it's not a surprise they needed to replace it. What is the exact model of the SSD.

What version is your OS? Also, do you have an external USB thumb drive (16GB or larger) which you can setup as a bootable drive?

I suspect your drive has a corruption so we need to test it out with an external bootable drive using Disk Utility.

Update (09/05/2015)

Well, to start with I would make a back up ASAP!

The reason I asked about the model was Samsung has some new firmware for the drive.

As to the OS the current release of Yosemite has a command line setting to enable TRIM services. Don't let the warnings scare you here it works quite well. Here's the details: Mac OS X 10.10.4 Supports TRIM for Third-Party SSD Hard Drives.

I would focus on Apples Disk Utility for fixing your drive but don't do this before you back up and you need to do this from the bootable thumb drive.

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The SSD is an Samsung SSD 840 Series with 250GB. At the bottom of the box is the model specification.

I don't know if it is relevant but here it is: MZ-7TD250

I have the latest OS X Yosemite 10.10.5 installed on the SSD.

And yes I do have a 16GB USB stick.

Just one thing to add: I just opened the "Hard Drive" section in the window "about this Mac". It says that my SSD is full and i have more than 3TB of programs o.O (on a 250GB drive)

However, if I scan my Hard Drive in the utility software "Daisy Disk" it says that I still have 40GB to go.

The thing with the data corruption seems legit. I had games crashing before because "data was probably corrupted".

I think I should sort out some stuff on the Hard Drive before investigating further. This might be the issue. What do you think?

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Ok, so I am currently backing up my SSD with my second internal Hard Drive using Time Machine.

After reading your reply yesterday I tried to repair the SSD using Disk Utility from Recovery Mode. It said that the Drive couldn't be repaired and I should save as much data as possible, then erase the SSD to set it up from scratch. I have a couple of questions because I am running into some issues doing this.

As I said the SSD is 250GB. the second internal Drive is a 500GB traditional HDD. There are some files on it so I did a partition of roughly 350GB for the Time Machine back-up. The back-up is running right now and it is 280GB big (about twice as big as the sum of all data I am backing up), therefore larger than the SSD itself.

Will I lose data trying to set up the SSD with the Time Machine back-up, which is too big?

And is the Time Machine bootable, so that i can just copy the back-up back to the SSD and instantly run the OS with all my data on it?

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And I have a boot camp partition on the SSD that I want to run on the HDD for the future. How can I transfer it to the HDD without installing the OS all over again (Windows 7 professional)?

Thank you very much for your help. This has been such a big help so far.

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Ouch! You have another issue here which could be the root issue. I assume you have the SSD in the optical drive carrier and the HD is in its original location. This model has an issue running SATA III (6.0 Gb/s) or auto setting drives like the Samsung. You'll need to get a fixed SATA II drive (HD or SSD) here as the systems platform controller is not able to support your SSD..

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You'll need to get an external USB drive here to backup your SSD. Hopefully you can salvage your important files. Instead of using TimeMachine you'll need to copy slowly a few files (2~3) at a time to allow the system enough time to do its CRC checks for each file. Once you get your most important files work on the others. Once done you'll need to re-think your systems configuration.

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