Released June 2012, Model A1278. Intel processor with Turbo Boost, Up to 512 MB DDR5 Video RAM

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850 EVO 120 GB SSD can't mount

I need some help,

I purchased a 850 EVO SSD which I can format externally using a thunderbolt case. I formatted it: Mac journal/partition1/GUID base for Mac but when I put the SSD inside my system the disk was not formatted properly so I can't install a fresh copy of the OS.

I need some help pls

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Can you give us the full serial number of your system or better yet see if you can correctly identify which model series your system is using EveryMac then tell us what you have.

Sadly there are a few different versions of the 13" MacBook which is why we need to know what you have.

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This series does have a fragile SATA cable. At this point I would replace it. Here's the IFIXIT guide to step you though whats needed: MacBook Pro 13" Unibody Mid 2012 Hard Drive Cable Replacement and here is the part you need: MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable Apple PN 923-0104

MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable Image

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if my unibody cable problem how can i boot and using the old hdd that contain os x yosemite TT - TT

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For laptop systems I use this adapter: Startech 2.5" SATA to USB adapter to attach the new drive to the system to prep it up as well as install the OS which I swap out the drive. You can also use an external USB or Thunderbolt case to hold the new drive. The other direction you can also prep up a USB thumb drive so its bootable and then copy over to it the OS installer.

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You might want to check your systems firmware to make sure its up to date. Follow this Apple TN to check: About EFI and SMC firmware updates for Intel-based Mac computers. Make sure yours is at or newer than whats listed in the TN. The older version had some issues with the SATA port that was fixed in the newer releases.

I would recommend going to Mavericks (or El Capitan) as it does offer TRIM services in the newer releases for 3rd party SSD's natively.

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Once you've replaced the SATA cable, as Dan suggests, then reinstall the SSD, attach the old HD through your Thunderbolt case, and format the SSD through the internal connection. Once that's done you should be able to install a new OS on the internal SSD.

The problem you're describing (SSD formats externally, but doesn't mount on the internal SATA bus) is a common problem with Mac laptops from about 2008-2011. Damaged SATA cables are often part of the problem; if you replace it with a brand new cable (not just a newer used cable), that often resolves the problem. Samsung SSDs such as the 850 have a reputation for being more fiddly on Macs than other SSDs such as OWC or Crucial/Micron. But typically, 2012 and later MacBook Pros will usually work with any SSD, as long as the SATA cable works properly and the drive is correctly formatted.

What operating system are you using? For a newer drive like this, later is better. I think the oldest OS you should be using is probably Mavericks/10.9.5.

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i used the os x yosemite 10.10.5 ... so i use then external casing for hardisk sata cable to formet the ssd because 850 evo can't format internally because i read at some community page said it . sorry if i missunderstand but ur saying by replacing a new unibody 850 evo can format internally?

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Use the external case for the original internal HD. Boot off the external HD, which used to be the internal HD. If you haven't tried formatting the SSD on the internal bus, because somebody somewhere said it wouldn't work, try it anyway; the problems are usually with machines from 2011 and before, not with 2012+ machines. If you can't format the SSD internally, then try replacing the internal SATA cable with a new cable, per Dan's suggestion. If you can't format the SSD internally at all, then you're going to have a very hard time reading/writing data to that drive - which is the real goal here. In all probability, once you've installed the SSD internally and formatted it from Disk Utility, you can then do a clean install of 10.10.5 or 10.11.5 onto the SSD, then boot from the SSD and transfer your data off the external hard drive using Migration Assistant.

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+1 Right on Adlerpe!

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I might add the SATA standard (connection wise) does not limit you which way you go prepping the drive externally or internally.

The only thing you can get in the way is the rating of the systems and drives SATA standards I/O speed: SATA I (1.5 Gb/s), II (3.0 Gb/s) or III (6.0 Gb/s).

In your case it's a not an issue here when swapping out your HD for the SSD as your system and the drive are both SATA III (you can encounter issues if you are setting up a dual drive config when using the optical drive carrier to hold the drive). Here your Samsung EVO drive has auto SATA speed sense so it matches the systems SATA port.

What you likely read was someone who encountered an issue with the SATA I/O speed and thought this was the way to get around it (it isn't). Basically, the specs of the drive need to list the systems SATA ports speed.

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done and i can formated it internally and i install os x yosemite 10.10.5 in that ssd 1st installation run smooth but after the mac restart and go to the 2nd installation sudden then ssd went missing and i tried reformet it and install it says failure system problem need to veryfy disk .... when i go back to veryfy its says error bla3 code 8"

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Actually there is two kinds of problem when trying to boot from SSD plugged in the internal SATA (even if the system can boot on the SSD in USB):

IF YOUR COMPUTER IS BOOTING, but you can't log in and you stucked in the "no entry sign" = "Prohibitory sign".

=> you made a wrong copy of the disk! Redo the job with CCC and no options, add a recovery partition

=> choose to boot from SSD

IF YOU COMPUTER IS NOT MOUNTING THE SSD : you get a question mark "?" at startup, then, it is a problem of cable.

=> change the SATA cable.

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@priss2niss - This is an older question that was answered that was accepted. While their can be new information or ways that the answer might have missed, its best to only list the difference Vs re-stating the same thing as an answer. You are encouraged to add a comment if you agree or even disagree with a given answer!

I personally discourage the use of cloning software. While it had its place back in the day, today it just messes things up! Please don't push it.

Today's OS's have very good utilities within them to repair as well as replace drives and the files on them.

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- TimeMachine is by far the best backup solution as it not only is able to do sequential backups of altered files so you can back wind to a given version it also only backs up new files as needed. Recovery is also very easy.

- Disk Utility While I'm not a lover of the newest version, it still offers most users a good means of testing their drive as well as fixing it. I personally like using Drive Genius as my basic tool HD repair tool.

- Migration Assistant is hands down much better than CCC ever was! It allows you to migrate to a new drive without worrying about the volume or file permissions. It allows you to move over just the user accounts, apps or the given users data files with ease. It even works with TimeMachine backups!

- MacOS Server if you deal with many systems and/or users this is the best method to maintain your users account setup on both their system and/or the servers they use.

Yes, there are other utilities out there, just be careful it supports the given OS release you are using. Apple has made quite a few behind the scenes changes within the OS that can effect a utilities ability to work correctly.

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