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...aand I feel so stupid. Seeing your screenshot made me realize I was reformatting the partition, not the actual drive itself. Originally it gave me an error and when I tried again it worked, then did the cloning process, mounted the EFI with no issue, copy/paste, unplugged original drive and...

Hmm.. that is what I had done but I'll do it again and see if that plus clearing the extra boot options in the bios fixes it. Thanks!

If i wanted to start over and initialize the drive and clone again, what would my first step be? Reformat in disk manager and clone again? Are there specific parameters I should format with? Or is there a way to initialize it that I may have missed?

Scratch that, I have NO idea why it was seeing that and worked. Once I removed the original drive I had no boot options, though I had like 4 UEFI OS "drives" in the bios... I mainly just wanted to replace the drive because it felt like my old one was starting to hang when idle for more than a...

So I mounted disk0s1, then disk2s1 and it mounted with an empty EFI this time. I copy/pasted the EFI folder and now the drive boots by itself, though the bios sees the drive as a Seagate Slim (is this from the new config.plist you gave me?) which I don't have issue with as long as it works. But...

So there are now 3 disks I can mount, and no matter which one I try to mount in EFI Mounter, it just mounts the one on the drive I'm running on (it mounts the folder with the zipped copy that I uploaded, that shouldn't be in the other drive). Any thoughts?

What do I do once I've replaced the config.plist? Also, I have also found a EFI backups folder in each drive that has EFI folders from when I updated to Sierra, is this something worth looking at as well?

How would you like me to post it? Screenshots of the folder(s)? Sorry, I have some depth of computer knowledge but it gets very shallow in other spots.

Hence my confusion... I initialized it in disk utility when I first plugged it in. Might I be missing something simple in CCC? I'm running everything sata->sata, should I try to use a usb dock? And yes I used sudo in command. I also get the error I posted above when mounting the disk1s1 efi in...

I got " Volume on disk1s1 failed to mount If the volume is damaged, try the "readOnly" option If the volume is an APFS Volume, try the "diskutil apfs unlockVolume" verb " Not sure why it would be considered damaged, but it refuses to mount the new drive's efi. Thanks for the help so far!

Used CCC on the drive and looks like it's all there, just can't mount the new EFI or access it. I feel like I missed a step or something went weird... please advise and thanks everyone! Also I'm running sierra but never updated the name, hence the ElCap->Sierra change

When trying to mount the new EFI, I get a "AppleEvent handler failed" error window. "Finer got an error." I can mount the old EFI just fine.

Trying to do this now and haven't done anything to my mac in a while so some of this is going over my head... I have the drive copied and can boot when the old drive is still plugged in. If someone can clear up how to copy the efi over to the new drive I would deeply appreciate it. I'm not...

Thanks for responding! I will try that.

Has anyone tried to use a hard drive from a apple computer to boot in a hackintosh? I'm hoping to try this soon and checking that there aren't any problems to watch for beforehand. Thanks

I'm having the same issue. Are you running El Capitan? From what I understand, El Capitan has known issues with USB3 support since they changed something between Yosemite and El Cap. I'm trying to roll back to Yosemite or Mavericks to resolve this (and a few other issues of mine). Hope this helps.

Hey All, So my refurbished macbook pro died a while ago (motherboard failure) and it just isn't worth putting any more money into it. I want to take the hard drive, which has Mavericks and all my old stuff on it, and boot it with my current build. Are there are precautions I should take? Would...

Update: I was able to fix it just now and I don't fully understand what happened but I can speculate and leave this here in case anyone else has the same issue. Isolated the drive that I attempted to put Yosemite on and connected it. Would not boot by itself (it had a somewhat functional OS on...

Peculiar Issue with Mobo Splash Screen Hang [Resolved] Hi all, I hope I am posting this in the right area and praying that someone recognizes this issue. This post will be a bit wordy, in which I apologize, though this appears to be very peculiar and I want to make sure all the details are...