I then continued to erase "Macintosh HD” as instructed. I have discovered multiple SW problems after I started the process of turning my MacBook Pro into original factory settings with my Mac.įollowing Apple’s instructions (), I used macOS Utilities tool to 1st erase ”Macintosh HD - Data”. I wish to turn my Mac OS 10.15.1 (19B88) MacBook Pro computer into factory settings, but I have run into technical problems. The reason for starting the process is that I ran out of memory in my Mac, even I have deleted all my personal files and folders from my Mac. Problem reformatting Mac OS 10.15.1 (19B88) MacBook Pro Problem (re-)starting up Mac OS 10.15.1 (19B88) MacBook Pro I cannot unmount disk0s2 "Macintosh HD" and without unmounting I cannot use "diskutil secureErase". The internal disk is listed as /dev/disk0, the Macintosh HD partition is /dev/disk0s2 Launchctl load /System/Library/LaunchDaemons/ The problem is that I cannot unmount the /dev/disk0 I read the diskutil manual on Apple website, and I would like to perform a "diskutil secureErase" to the entire disk, with 7 passages DoD wiping method in order to make irrecoverable all my data. However, it starts in single user mode: CMD+S at the startup, with command line interface. I cannot run the recovery mode D or ALT+D (recovery mode via internet) because iMac loops and cannot load even the recovery interface. I would like to wipe out the entire hard drive in order to sell the iMac as broken computer for spare parts. My local Apple Store refused to apply another replacement because the replacement program is terminated. Unfortunately even the replacement unit was faulty after 3 years. In 2014 the AMD videocard was replaced during the Apple official AMD 6970M replacement program. It cannot start up properly, the boot-up stops right after the white display with grey Apple logo and then the iMac starts looping. # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info.I have an iMac mid 2011 with faulty AMD 6970M 2 GB videocard. # Accessible filesystems, by reference, are maintained under '/dev/disk/'. # Created by anaconda on Tue Dec 17 03:28:04 2019 It happens mostly when you have a remote filesystem. In my case, I want to edit the tekneed filesystems that are preventing my system from booting by commenting it out (#). mount the real rootfilesystem depending on the way you boot to single user mode # chroot /sysroot 3. boot into single usermode as done above 2. Some filesystems defined in the fstab can prevent the system from booting, to make changes to fstab, do the following. To be able to perform some tasks and make some changes, the root filesystem is required to be mounted on “/”, hence it will require the use of chroot tool to be able to mount the root filesystem on “/” logically. More so, using some of these methods will make the root filesystem to be mounted on /sysroot. To be able to make any changes, the root filesystem permission needs to be changed to read-write (rw). Going forward, with these methods we are going to use in the “ ACTION TIME” section, the root filesystem, after being mounted will have a read only (ro) permission. This mode is basically used for maintenance like we earlier said, and troubleshooting such as, resetting a lost root password, repairing bad filesystems (fsck), editing the fstab file to make the system boot properly, stopping services disrupting the system from booting, etc In single user mode, the system is booted to a minimal environment with filesystems(local filesystems) being mounted, but without network services, the full operating system is not functional in this mode and most services will be manually started. In this subject matter, we will look at how to boot into a single user mode (runlevel 1) without the imputing the root password. However, both methods will require the input of the root password. In one of the articles on this site, I discussed how a system runlevel/runtarget can be changed from an operational/command mode and how it can also be changed from the boot menu. Single user mode is also referred to as runlevel 1 and can be called emergency or maintenance mode.īooting in this mode can be done in many ways. From the word single, single user mode is the mode in a Linux system where only one user, the root is allowed to perform system tasks.
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