Short version: Need help finding, diagnosing and fixing the internal factory installed Samsung SSD that has vanished after hard reset. Trying to retrieve data or avoid data loss with whatever options there are.
[Before I start I have links at bottom that may be similar problems that a more knowledgable person may be able to utilise to help here I am not sure.] I think this may be a similar fix with this: (I will post link later so it is not considered Spam) although the problems/causes are not the same.
So to begin: After a hard reset I found a flashing folder meaning no bootable drive. I was using High Sierra or later OS --I say later because am not sure what my last recent upgrade was if it was to later version High Sierra, Mojave, or Catalina but it was fairly recent and I had High Sierra before that for sure; so APFS was almost surely on the SSD format. I expect this solely from having High Sierra in use, which I had for a while.
I had no troubles but then had the OS freeze on Safari or chrome web stuff with multiple folders left open. I had maybe about 50G of space left on the SSD at the time of freeze. so I did a hard reset here (Just holding the power button to shut off) when I know I should have waited. Upon reboot I saw a dreaded flashing folder. Booting in recovery mode with only the internal SSD in (internet was required) I found that the factory Samsung internal SSD was not recognized--Only Disk0 and base OS X in Disk utility and Diskutil list from terminal. When trying to reload the OS from here (internet recovery) no disk or Hard drive/SSD was recognized. This is when I started learning about computers-- quick, and the importance of back-ups and stuff... Foolishly I did not have back up, and I must Say that I had just bought 2 San disks here to create back ups but I just never got to it. So the system froze up before I got to securing my data.
Anyway here I forget the exact order I did things and I should have written that down-- I know I did SMC reset. And the Boot into recovery--But the drive was not there to do anything that is recommended such as reinstalling the OS or doing first aid on the drive. I eventually put 2 different working OS-- [Catalina and Sierra] on two different external drives and also created a bootable drive on another hd.
So rationalizing-- did the hard reset mess with the drive during a super important root process? Did I get my partitions messed up as well?..From an improperly unmounted SSD? Was Bootloader or EFI boot loader locations scrambled?
I imagine that I must do the same thing as in another post: disable SIP and run some non intrusive fsck commands (get GPT FDisk as well??) to find out or fix stuff. But I am not sure and I need pro help to run any modifying commands for sure. I have scoured the support forums, but then got on here and this one seems quite intense--many with greater experience here who can help build up the resource.
I am trying to recover the drive so I can extract data and make use of the drive; or clone/copy the drive, then just reformat the SSD if that is safest? Make the SSD safe for use and I would keep all data on external drives ( I now have 3) this would be ideal. But another great outcome would be if the drive is mountable so I can at least access and extract the data I need, and go from there.
So what else to relate:
I can load into recovery mode (cmd + r) (cmd+Opt+R) both of which go into internet recovery.
I have 3 sandisks; (1 with Catalina, 1 with Sierra and one with data); and one toshiba drive with a sierra bootloader
In disk utility in recovery mode (with only the damaged/mixed drive in) I am only able to see Disk0 and OS X base system. Installing OSX from here (on external drive) yields the first OS X on this 2015 MBP which was Yosemite but no option there to show all devices in disk utility; in the view menu now in Sierra I ensure ‘Show all devices’ is enabled, and still no volume name for that which I would expect to see ‘Macintosh HD’ or SSD whatever it is named And I know I did the same in Catalina.
I contacted official Apple support (online), and once I explained that reseting SMC and PRAM didn't work and that I could see no drive names listed under my internal SSD, the girl mostly began talking about getting service for the hardware. So I later put Catalina on one of the external drives and system is running fine. (I am using Sierra now though on a different external drive) But still need to fix issue with internal drive and retrieve data.
I sincerely thought that if I could just put an AFPS system on the mac that it would be able to read the SSD... No
Cannot try Target disk mode on another Mac, I do not have one; I have a very old pc; but I would be blowing dust off of that so I doubt it can help.
Internet recovery mode works and safe mode but if I put in the internal SSD things seem to go real slow, and hot.
Recovery mode Disk Utility on the Internal SSD -- First Aid cannot be used as no disk is found
Thanks in advance for any help and time put forth.
-Will sleep now so apologies if I delay in any quick responses from the forum...
Thanks for reading!
Any more info needed?
MBP retina A1398 ...
2.2 ghz intel i7...
16gb 1600MHz DDR3...
15.4 inch mid 2015...
Boot ROM 199.0.0
SMC 2.29f23 ...
Model identifier 11,4..
SSD model info: [Samsung Model MZ-JPV2560/0A4 256GB SSUBX 655-1858F 2015.04]
MacBook Pro 15″, OS X 10.10 (installed)