![]() Set the startup drive to the internal SSD.(note from me: be damn sure you have the right "source" and "destination" or you'll be sad! Clone the external drive to the internal drive using Disk Utility's Restore option.Boot from the Recovery HD on the external drive.(note from me: be sure to check advanced options and make sure GUID Partition Table). Open Disk Utility then partition and format the SSD for use with OS X.Boot the computer from your old drive that is installed in an external enclosure.(note from me: a backup is a good first step!) It was slightly different than my usual steps, but I think I'll use this method from now on: Once I installed that, I was able to partition the drive, and everything went the way it should.īy the way, I followed these steps for migrating to the new drive, provided by a very helpful Apple Communities guy named Kappy. You can compare and download if needed here: Other users have had the exact same problem: can't partition, erase, install, or boot from the drive. I found this out when searching the Crucial SSD forum. It appears to have been an EFI update we were never prompted to install. I could really use some sage guidance here! Repeated attempts to repair and erase have resulted in worse results, until I took the SSD out, used it externally again, and put it back in. I've already done the installation and time machine process twice, with the same results. I have confirmed the drive is fine and the cable is fine, because the original HDD works fine if I put it back in the Mac, and the SSD works fine if I put it back in an enclosure. My Macintosh HD volume is grayed out and can't be mounted. Regarding the Yosemite SSD problem, everyone on the internet points to this:īut this assumes the drive can be mounted. It's unclear to me if this is some kind of OS X problem, or if this is because of the 3rd party SSD issue that so many are plagued with, since Apple decided to lock down kext signing. I put it inside the MBP, and I go automatically to Recovery. I installed and time machine'd it as an external drive, and it booted just fine (using the Option Key). I have just installed a Crucial M500 SSD into a Macbook Pro. I am having trouble because I can't tell exactly what my problem is, in order to find the solution.
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