It might take 30 mins to 3 hours to complete the process. Make sure that mac is fully charged or at least charged enough to complete the reinstallation.Now, we will be discussing a few ways that will help you to learn the vital things that you need to consider before reinstalling the macOS. Preparation Before Reinstallation Of macOS If your system has been upgraded but has a corrupted macOS, or halted in between, then it demands reinstallation. There are numerous causes that require reinstallation of the operating system. Other IssuesĪbove, we have discussed just a few reasons when you have to reinstall the OS. Even other problems can be resolved if you visit the mac recovery mode. If you face any bootstrap or startup problems, then it’s high time to reinstall your operating system. If you do not install it at the right time, then it might damage your system more. This can infect the functioning of macOS, and thus a complete installation of the tool is required. Thus, reinstalling the operating system to resolve it. And, to fix the issue you need to run troubleshooting. It might be possible that due to different reasons your operating system has been corrupted. You might observe some malfunctioning and could not complete the required operation. If there is any firmware issue, then you have to reinstall the operating system or else it might damage your system more. Below we have listed a few points for which you need to reinstall the macOS. There are many reasons that will lead you to go for reinstalling macOS on your system. Problems that Force You to Reinstall macOS All the related information is given below. First, you need to know when you have to reinstall macOS without losing data. If you don’t reinstall at the appropriate time, then there is a possibility that you will lose your important documents and files. It might be possible that there are other reasons or causes for which you want to reinstall macOS. If you see that your mac is functioning abnormally or has slowed down, then it’s time to reinstall macOS to improve things. If you have any problem please do comment below.Mac is a renowned brand and users mainly choose mac for its amazing security feature. Trash and all the contents of your pen drive then type rsync -aH -exclude= ~/Library ~ /usb then it might take some time to take backup of your pen drive depending on the size of your home directory after it has completed type shutdown -h now. You might see some few lines such as kext like that if your disk was successfully mounted to make sure type ls -la /usb you should see. Then type mount -t msdos /dev/diskXs1 /usb (Note: X will be your disk identifier and if the file system o your pen drive is hfs or so make sure you replac msdos but if your pen drive is Fat or exfat don't change it. Once find that you might see disk3s1 or disk4s1. Once you plug it in then wait for it to get recognised you should see a message suck as "USBHUB" like that once you see that type mkdir /usb then find the disk identifier of your pen drive by typing ls -la /dev/disk* you will find listings such as disk1 or disk1s1 your pen drive might be last disk listing. But I do still recommend taking a backup by booting into recovery and click Utilities in the upper menu bar and then select terminal then type csrutil disable then type reboot then when your Mac boots up and when you hear the chime hold CMD+S then wait until the plain text is done loading then type mount -uw / then grab a pen drive to plug in to your Mac and take a backup of your Mac. Reinatalling the os alone does not erase data. Again, the corruption might make this impossible. Otherwise, find a friend's Mac, and follow these Apple instructions to set your Mac in 'target disk mode' and allow the other Mac to access your files to copy them off. I recommend you review the step by step guides at to see if you are brave enough. Newer Macbook/Macbook Pros and iMacs make it much more difficult, as their SSDs are not removable or very difficult to remove. An older Macbook or Macbook Pro likely has a hard drive that is removable, allowing you to connect it externally using an enclosure or cable. To gain access to the disk depends on what model Mac you have. I will take this time to remind you that the time for backup is BEFORE you have an issue, so hopefully you have a Time Machine backup or Carbon Copy Cloner disk around. However, if there is a corruption issue, your data may be corrupted as well, its really hard to tell. Reinstalling macOS from the recovery menu does not erase your data.
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