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I had a 2012 MacBook Pro with an OWC Data Doubler instead of the SuperDrive. My 2012 died and I bought a 2016 MacBook Pro. I removed the drive (a 1TB WD hard disk drive) from my old 2012 MacBook Pro to get some data from it by connecting to an external USB enclosure but I can't seem yo mount it.

Does anyone know what the problem might be? and/or how to solve it?

Here is a screenshot of disk utility:

enter image description here

Here is a screenshot of the system information on the device:

enter image description here

  • Clarification so you understand my edits: All the OWC Data Doubler does is provide a nice way to internally mount a SATA drive in an optical bay. Meaning it’s just a SATA drive. And I see you are connecting it to a USB bridge that identifies as “Seagate BUP Slim Media” which is an external USB enclosure OWC sells as an aftermarket external enclosure. It seems like the drive itself might be dead. What was on that drive? Since the system has two driveswhat did the main drive have on it? And when you say “died” are you sure it wasn’t simply the drive that died and that is what you are facing now? – Giacomo1968 Aug 2 '18 at 17:58
  • Is it being recognised as the correct drive/enclosure type? I wasn't aware the seagate backup plus had a 'plug-in' drive option. – Tetsujin Aug 2 '18 at 17:58
  • @JakeGould Im not certain if the drive is dead or not, however I pretty sure its ok. It didn't have the OS on it and when I tried to reinstall macOS on the system SSD it failed multiple times. I might be wrong but would a failed second data drive affect the OS? – James Aug 2 '18 at 18:06
  • @Tetsujin I took an old Seagate enclosure apart and attached my own HDD to it. – James Aug 2 '18 at 18:07
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    My bet is the enclosure is messing with the format, hiding it behind its own format.[They change the (apparent) block size, I think] Get a generic one meant for dropping spare drives in, instead. – Tetsujin Aug 2 '18 at 18:13
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Way late to the party and you've probably already resolved this, but whenever I have HD problems, I cut out the enclosure and use a SATA-USB adapter.

If it still wont mount, you can use a data recovery tool, like Disk Drill, which you can try for free and I wound up buying, or Disk Warrior, which you have to buy outright. Using the former, I managed to recover about 85% of the mkv files I had stored on an actual Seagate BUP Slim (never again). Disclaimer: I'm not an employee or paid shill for any of the companies mentioned.

Good luck, MB

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