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2.2 GHz (Turbo Boost使用時最大3.4 GHz), 2.5 GHz (Turbo Boost使用時最大3.7 GHz)もしくは2.8 GHz (Turbo Boost使用時最大4.0 GHz) L3キャッシュで6 MBのクアッドコアIntel Core i7プロセッサ

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Unbootable MacBook Pro can't boot up through an external HD

I have a MacBookPro 2015 with High Sierra. It can't boot up. It is stuck at the startup black background with apple logo and the progress bar. In verbose mode, I saw I/O errors. I think the SSD is having problems. I want to get some files from the internal drive. I have a hard time booting into the internal drive recovery mode. I can boot into the internet receovery mode, but it takes a long time.

So I boot into the recovery mode with a thumb drive (a bootable High Sierra installation drive). However, I have problem creating disk image of the internal drive or recover the internal drive to an external drive with Disk Utility. I have tried with terminal to copy the files/directories from internal to external, but cp/mv commands do not work:-(

So I have installed Mojave MacOS on an external USB drive from a new iMac with Mojave. The external drive can boot up the iMac. But the Startup Manager in the recovery mode (through thumb drive) can't see the external drive! I unplug the thumb drive, and the thumb drive and EFI boot are unmounted. I plug the thumb drive back, and those 2 drives show up again. So I try this with the external drive, but it still can not see the external drive with Mojave. How can I boot up the MacBook Pro with my external drive?

Any suggestion is much appreciated!:-)

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Other solution would be to remove the back plate of your Macbook and remove the SSD.

On ebay or even Amazon you can find adapters from your SSD to usb so you can connect you drive tu other Mac and recover your data.

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Unfortunately, I am currently not in US, and it is not easy to get the adapter. But that is a good suggestion if I can get the adapter:-)

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Tom168 さん、ありがとうございました!
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