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Fix 'the disk you inserted was not readable by this computer' on Mac

Posted by Abby Haines to Resource 2017-07-21

Summary

Easy and efficient methods to fix 'the disk you inserted was not readable by this computer' error on Mac are offered here. Try them one by one to get access to your external hard drive, SD card, USB flash drive or even an Android devices. Download EaseUS Mac recovery software to help if data recovery is required.

USB says 'the disk you inserted was not readable by this computer' 
"My Sandisk USB flash drive becomes unreadable and inaccessible for unknown reasons. Whenever I plugged it into my MacBook, I get the error message 'the disk you inserted was not readable by this computer.' I have many family pictures and working documents saved on the USB, is there any way to fix the flash drive and get access to my data?"

the disk you inserted was not readable by this computer

Fixes to 'the disk you inserted was not readable by this computer' error 

To open removable storage devices like an external hard drive, SD card, USB flash drive or even an Android phone or tablet, you usually have to insert it into a Windows computer or Mac. But if the system files or the disk is corrupted, error messages will pop up and prevent you access the device and data. In Mac OS X, the error message usually reads 'the disk you inserted was not readable by this computer.' 

Just like what happened in the story mentioned above, many Mac users have a similar experience of this issue and want to find a fix.  Here, our advice about how to solve this problem is:

Step 1. Check the Mac system. Just plug in a different external hard drive to Mac, if it appears on Finder, it suggests that the problem has to do with the external USB devices, not the Mac. 

Step 2. Check the file system format of the external hard drive, SD card, USB flash drive or other devices. If it is formatted with the NTFS format, then it is not hard to understand why it is unreadable on Mac. To correct it, please convert NTFS to FAT32. 

Step 3. Verify or repair the unreadable disk, USB or SD card use Disk Utility

1) Choose Go --> Utilities.
2) Double-click Disk Utility.
3) Select the volume in the left pane for which you want to repair permissions.
4) Click the First Aid tab.
5) Select the volume to which you want to install the Adobe application, and then click Repair Disk Permissions.

Step 4. Recover data and format the unreadable drive if the problem continues. Before starting, please download and install EaseUS Mac data recovery software and connect the external hard drive, SD card, USB flash drive or other removable devices to your Mac first. 

1. Select file types - it ensures you to find the target files you want to recover in the shortest time.

Recover data from 'the disk you inserted was not readable by this computer' error - select  file types

2. Choose the specified volume or storage location - choose to scan the external hard drive, SD card, USB flash drive or other removable devices to find all the recoverable files.

Recover data from 'the disk you inserted was not readable by this computer' error - choose to scan the 
specified disk

3. Preview and selectively recover data - preview all the recoverable files and select those you want and click "Recover" button to retrieve them back.

Preview and recover data from 'the disk you inserted was not readable by this computer' error

After data recovery, you can format the unreadable external hard drive, SD card, USB flash drive, etc to fix it for reuse. If 'the disk you inserted was not readable by this computer' error is still consistent after trying all the methods, we recommend you to purchase a new device and be prepared for a drive failure soon.