When booted into restoration, with a clear SSD and utilizing a bootable installer on a flashdrive, the boot course of was not solely by the bootable installer. An extra quantity had been created subsequent to the bottom system, the two volumes entitled “MACOS Base System”. The additional quantity included a preboot and couldn’t be deleted, even in single consumer mode for a string of causes.
Repeated reinstallation of macOS didn’t treatment points with installer information at all times reappearing and masquerading as base system information. This was brought on by distant entry a 3rd occasion clearly had. The set up log reported that the restoration drive was not a Disk Picture, because the label said, and information inside it had been clearly not base system sort information. The SSD was being required to be unlocked too early than ought to be the case.
This was solved by connecting a SSD from one other Macbook through a USB port, with the bootable installer in one other USB and upon a restoration boot, the bottom system from the connected SSD was utilised with none operator enter and disk utility confirmed the bottom system as “OS X base system”, the right label and content material. It was a real disk picture.
The bootable installer supplied the remainder of the macOS and a clear set up of macOS achieved. I imagine the booting subject was a difficulty recognized in 2011 by Jorge Jenderek and is the topic of quite a few articles by others since and impacts Unix and different methods – thanks Jorge.
