Does Reinstalling macOS in Recovery Mode Delete Everything on Mac?

Jean updated on Feb 20, 2019 to Mac File Recovery | How-to Articles

Summary

macOS Recovery can help you easily reinstall the Mac operating system on your built-in drive or an external drive. This blog answers "Does reinstalling macOS delete files?" Besides, it also suggests using EaseUS Data Recovery Wizard for Mac to recover lost and deleted files in the easiest and safest way.

"My macOS High Sierra got corrupted, and the login screen doesn't appear. If I reinstall macOS from recovery menu will my previously installed software and data be deleted? And if so how can I back them up on a hard drive, the data and the software are very important to me."

Reinstalling macOS of macOS Recovery can help you replace the current problematic OS with a clean version quickly and easily. Technically speaking, simple reinstalling macOS won't erase your disk either delete files. You probably don't need to erase, unless you're selling or giving away your Mac or having an issue that requires you to wipe. Besides, If you suspect there's something wrong with your startup drive, you can use the Disk Utility to scan and repair them from the recovery screen, which might be a quicker and more convenient alternative than erasing and reinstalling your macOS.

macOS recovery mode

How to Recover Data When Mac Needs to Be Erased and Reinstall macOS

If you're encountering the same issue as said at the beginning of the article, that your computer gets corrupted, and you have to consider a complete restart in Recovery Mode. At this time, you need to use the Disk Utility in macOS Recovery to erase your Mac hard drive first, and go on to reinstall the macOS.

As well all know, erasing the hard disk on Mac will inevitably cause data loss and make the files unrecoverable. How to recover data in the easiest way when Mac failed to start? Don't worry, here comes the EaseUS Mac data recovery software, which enables you to create a bootable USB drive on another Mac that works well, then, restart your Mac from it, and go ahead to recover files. Especially to restore data on system drive under macOS 10.13, it's very safe to recover from bootable media. Useful for any emergency, no secondary data damage!

Now, follow the step-by-step guides below to see how to recover data from Mac that fail to start and need to erase and reinstall OS. The whole tutorials will be divided into two parts: how to create a USB bootable media and how to recover data from bootable media.  

How to Create a USB Bootable Media

Step 1. Install and run EaseUS Data Recovery Wizard for Mac on another Mac computer, select "File" > "Create Bootable USB". Then, choose a USB drive to create the bootable disc.

Mac data recovery from bootable media - step 1

Warning
The creator will prompt to erase the drive to reallocate the space, then it can write the bootable files to this drive. Please back up all USB files with EaseUS Todo Backup for Mac before processing "Eraser".

Step 2. The program starts to create a 2GB space and save the boot files. The rest space on the USB can be still used for storage.

Mac data recovery from bootable media - step 2

Step 3. Once it completes, please follow the guide to boot the corrupted Mac from the bootable disc and start the recovery.  We suggest you restore the data to an external hard drive. 

Mac data recovery from bootable media - step 3

How to Recover Data from Mac Hard Disk

Step 1. Select the disk location (it can be an internal HDD/SSD or a removable storage device) where you lost data and files. Click the Scan button.

select the location where data lost and click scan

Step 2. EaseUS Data Recovery Wizard for Mac will immediately scan your selected disk volume and display the scanning results on the left pane.

scan the selected disk to find lost data on your Mac

Step 3. In the scan results, select the file(s) and click Recover Now button to have them back.

click recover now button to recover lost data on your Mac

After the data recovery, you can use the "Disk Utility" to erase your Mac disk, and then choose "Reinstall macOS" to finish the reinstalling. 

See More about EaseUS Data Recovery Wizard for Mac

EaseUS Mac data recovery program allows you to recover deleted files from the emptied trash bin, internal/external hard drive, SSD, corrupted or formatted memory card, including memory sticks, SD cards, CF cards, XD & MMC cards. Besides, it also enables you to recover lost Word, Excel, PPT, etc. 

 
 

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Frequently Asked Questions

1. Why choose EaseUS Data Recovery Wizard?

"EaseUS Data Recovery Wizard is the best we've seen. It's far from perfect, partly because today's advanced disk technology makes data-recovery more difficult than it was with the simpler technology of the past, but it's fast and efficient..."PCMag

"The first thing you'll notice about EaseUS Data Recovery Wizard Pro is that its interface is very clear and uncluttered, with only a small collection of self-explanatory controls. You won't find lots of extra options hidden in a system of hidden menus, either; what you see really is what you get."techradar

"Recover lost files, even after deleting a partition or formatting your drive."Macworld

2. Why cannot I recover 2GB data for free?

It is recommended to check the version installed is Free or Trial because they are different versions.

Trial has data preview function but cannot save any files, while the Free version enables to recover 2 GB files. The default free space is 500 MB and you may share the product on social media to get another 1.5 GB.

3. Why cannot the recovered files be opened?

A file is saved as 2 parts on the storage device: directory info (which is comprised by file name, time stamp and size info, etc.) and data content.

If the files with original file names and folder structures cannot be opened, one possible reason is the corrupted directory info. There is still a chance to recover the data content with the RAW Recovery method in our software.

4. Why isn't it suggested to recover the files back to the original drive?

The storage structure of the lost files would be altered or damaged by any changes on the drive. If you save the recovered files back to the same drive, the original data structures and data content would be corrupted or overwritten, which causes permanent data loss. So you should prepare another disk to save the files.

5. How can I check whether my data is recoverable or not before purchase?

The Free version helps you save 2GB files, so verify the recovery quality of our product before purchase.

6. How long does it take to scan the drive?

It strongly depends on the capacity of your hard drive and the performance of your computer. As reference,most drive recoveries can be completed in around 10 to 12 hours for a 1-TB healthy hard drive in general conditions.

About Data Recovery Wizard

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