USB flash drive is not readable Mac - how to fix and recover data?

Posted by Juno to Mac Data Recovery on December 27th, 2017

USB flash drive is nearly the most convenient storage device to store files and transfer files among several computers. But sometimes, our USB flash drive is not readable on Mac. When we connect USB flash drive to Mac, we will get the error massage "The disk you inserted was not readable by this computer." with three options: initialize, ignore and eject.

'USB flash drive unreadable on Mac' is quite worse a scenario for us and can be caused by a variety of reasons. But what we most want to know is how to fix unreadbale USB flash drive on Mac and get lost files back.

Three methods to fix 'USB flash drive is not readable on Mac' error

USB flash drive unreadable error may caused by logical and hardware problems. Based on different situations, here are three methods to repair unreadable USB drive.

Method 1: Fix 'USB flash drive is not readable on Mac' error with First Aid

First Aid is a Mac build-in function that can help fix errors.

1. Launch Disk Utility from Utilities.

2. Select the unreadable USB drive at the left part of the window.

3. Click First Aid at the top of the window, click Run, and then wait until the repairing finishes.

Method 2: Recover data and then fix it by reformatting

It should be noted that reformatting the drive will clean up all files on the unreadable USB flash drive. So for the security of our data, we should firstly recover data with professional USB drive data recovery software and then fix the drive by reformatting.

Step 1: Recover data from not readable USB flash drive with iBoysoft Mac Data Recovery

iBoysoft Mac Data Recovery is a free Mac data recovery software software that can recover data from unreadable USB flash drive, recover data from formatted USB flash drive, recover data from unmountable USB flash drive, recover data from corrupted USB flash drive, recover deleted/lost files from USB flash drive, etc. It supports data recovery from APFS, HFS, HFS+, exFAT, FAT32 drive on macOS Mojave 10.14/High Sierra 10.13/10.12 and 10.11/10.10/10.9/10.8/10.7.

Aside from USB drive data recovery, iBoysoft Mac Data Recovery can also recover data from many other storage devices, hard drive, external hard drive, memory card, pen drive, etc.

Tutorial to recover data from not readable USB flash drive on Mac with iBoysoft Mac Data Recovery

1. Connect the not readable USB flash drive to Mac.

2. Launch iBoysoft Data Recovery, and select the not readable USB flash drive.

Recover data from not readable USB flash drive on Mac

3. Click "Next" to search for all lost files on the not readable USB flash drive.

4. Preview the listed recoverable files, choose those we want, and click "Recover" to get them back.

After successfully get lost files back, we can fix USB flash drive is not readable Mac error by formatting it as the steps below without worrying about data loss.

Step 2: Fix not readable USB flash drive by reformatting

1. Launch Disk Utility from Utilities.

2. Click the icon of not readable USB flash drive on the left part of the window.

3. Click the Erase on the top of the Disk Utility window.

4. Complete the related information (name, format, scheme, etc.), then click Erase button.

Method 3: Send the not readable USB flash drive to a local technician

There are times that the not readable USB flash drive even can't be found in Disk Utility. Under that condition, the first 2 methods can no longer be helpful. So we can try to recover data from the drive with iBoysoft Mac Data Recovery, and then send the drive to a local technician for help.

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