USB flash drive not readable on Mac, how to fix and recover data?

Posted by Admin to Mac Data Recovery on February 28th, 2019

I stored the important data in USB flash drive, one day, when attempting to access it and I get a message: "The disk you inserted was not readable by this computer. There are three buttons: Initialize, Ignore, Eject"

The disk you inserted was not readable by this computer

Solution 1: Fix "USB flash drive not readable" error with macOS inbuilt Disk Utility

macOS built-in disk utility has the ability to fix unreadable USB flash drive error, please open Applications -> Utilities -> Disk Utility -> Select the unreadable USB flash -> Run First Aid. If First Aid fails to repair unreadable USB flash drive, please go to solution 2 to recover data from unreadable USB flash drive.

Solution 2: Recover data from unreadable USB flash drive

As a professional Mac data recovery software, M3 Mac Data Recovery can recover data from unreadable hard drive, recover deleted files emptied from Trash, recover data from formatted drive, recover data from deleted/lost APFS partition, recover data from APFS drive, etc. in macOS 10.14 Mojave/10.13 High Sierra/10.12 and Mac OSX 10.11/10.10/10.9/10.8/10.7.

Tutorial to recover data from unreadable USB flash drive

Step 1: Download, install and launch M3 Mac Data Recovery on your Mac computer.

Step 2: Select unreadable USB flash drive.

Mac data recovery software

Step 3: M3 Mac Data Recovery is scanning the data from unreadable USB flash drive.

Scan lost data from unreadable USB flash drive

Step 4: Select the found files you expect to recover and then click Recover to save them.

Recover data from unreadable USB flash drive

Solution 3: Reformat unreadable USB flash drive

If there is no important data stored in USB flash drive, we can directly reformat it and then it will be working again after the format completes. If there is important data, we can reformat unreadable USB flash drive after data recovery is successfully done. Following is step-by-step tutorial to reformat unreadable flash drive on Mac:

Step 1: Launch Disk Utility from Utilities.

Step 2: Click the icon for unreadable USB flash drive in the sidebar on the left.

Step 3: Click the Erase tab along the top of the window and enter the related information.

Step 4: Click the Erase button.

Step 4: Click the Erase button to reformat unreadable USB flash drive, the unreadable USB flash drive will be working again after reformatting completes.

Solution 4: Seek help from a local data recovery professional

If USB flash drive is not readable by any Mac data recovery software, please send it to a local data recovery professional for help if you have important data.