ive been researching and fighting this for a couple days now. I tried recovery boot, disk utility, repair etc.. nothing seems to fix this…
heres what happened..
this 'puter was just fine, nothing wrong, runs great, use it for software dev. I "stupidly" clicked on update for High Sierra and it upgraded to high sierra. rebooted, came up but was running slow.
A couple days later, a high sierra update showed up, so thinking it would fix my slowness i installed it…
Rebooted… Prohibit symbol.. rebooted… rebooted …. prohibit symbol…
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PRAM reset, SMC reset, rebooted… same
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recovery booted, loaded recovery fine, did Disk Utility, it says the drive is fine. rebooted… same
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recovery again, use terminal i can see the files, they are there, i can browse in terminal..
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did FSCK from terminal completes all is fine… rebooted… same
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created a recovery thumbdrive with a working copy of high sierra on another mac, booted from that, tried to do reinstall OS, did its thing, rebooted… same…
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Tried the gpt delete add, rebooted .. same…
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Ideas?
Here are some details
-bash-3.2# diskutil list /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *750.2 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_CoreStorage Macintosh HD 749.3 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 /dev/disk1 (internal, virtual): #: TYPE NAME SIZE IDENTIFIER 0: Apple_HFS Macintosh HD +748.9 GB disk1 Logical Volume on disk0s2 3219E74D-E794-411D-836C-39FA507F94C5 Unencrypted -bash-3.2# diskutil cs list CoreStorage logical volume groups (1 found) | +-- Logical Volume Group 9FEA1FA4-F17A-4760-BDDE-26720CDAF4C5 ========================================================= Name: Macintosh HD Status: Online Size: 749296615424 B (749.3 GB) Free Space: 0 B (0 B) | +- Logical Volume Family CBEDC035-AB5C-4683-BC47-755288A34DE2 ---------------------------------------------------------- Encryption Type: None | +-> Logical Volume 3219E74D-E794-411D-836C-39FA507F94C5 --------------------------------------------------- Disk: disk1 Status: Online Size (Total): 748944293888 B (748.9 GB) Revertible: Yes (no decryption required) LV Name: Macintosh HD Volume Name: Macintosh HD Content Hint: Apple_HFS
Best Answer
I had a similar issue with my MBP 2012 (SSD installed for the past 3 years or so), never had any problems until after a flight the other day.
Thought the X-Ray may have damaged the SSD so reinstalled etc. and nothing worked.
Turned out my data cable for the HDD is damaged and needs to be replaced.
Currently got my SSD in a disk caddy and working fine.
I also used an amazing tool called Stellar Data Recovery on my iMac to recover data on the SSD before formatting which really saved my bacon.