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I use a 1tb external drive for my Macbook Pro. I got it as a gift and the hard drive isn’t detected no matter what I do. It’s a 250 gb Samsung SSD and it won’t detect it. I have tried a different drive and even a new flex cable but neither have worked. Can somebody help me out?
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Formatting! What system is your external drive and internal drive running? How are they formatted, APFS vs standard GUID?
UPDATE 4/16/20
Upgrade your Lion disk gradually thru the systems as there is probably an EFI Firmware update that your machine has missed
这个答案有帮助吗？
I put the ssd into another MacBook Pro mid 2012 and it booted right up.
OK, move both the drive with the cable back to the other machine.
Then what should I do?
My external is running mac os x sierra and my internal is running mac os x mountain lion.
Then what should I do? See if it works and tell us.
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