How to repair/fix unreadable USB flash drive on Mac?

Posted by Autumn X to Mac Data Recovery on July 18th, 2017

I have a 32 GB USB which has suddenly come up with a message that "the USB flash drive is not readable by this computer" (Apple MacBook Pro). The options available are to initialize, ignore or eject. I do not want to initialize it as this will result in loss of my data. I have tried the following ways without success: ejecting and reconnecting the USB, inserting the USB to another Mac. There are important files on it, how can I fix unreadable USB on Mac and recover data?

It is a terrible situation for all of us when our USB drives become unreadable. When USB drives become unreadable on Mac, what we care about most is the way to fix/repair the drive as well as security of data on it. But lots of users have no idea about how to fix this problem. Therefore, this article will offer solution to fix/repair unreadable USB on Mac without data loss.

Solution to fix/repair unreadable USB on Mac without data loss

Here are three solutions can help:

Solution 1: Fix unreadable USB drive with First Aid

When the unreadable USB drive only has minor errors, First Aid is capable to fix it.

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.

Solution 2: Reformat the unreadable USB drive to make it readable

When the drive has been seriously damaged or has terrible errors, First Aid can no longer fix it and we need to adopt Solution 2. It should be noted that reformatting will erase all our data on unreadable USB drive. For the security of our data, we should recover data from unreadable USB drive, and then fix/repair unreadable USB drive on Mac by reformatting it.

1st Step: Recover data from unreadable USB drive on Mac

iBoysoft Mac Data Recovery is all we need to recover data from unreadable USB drive on Mac.

Download iBoysoft Data Recovery

As a professional Mac data recovery software, iBoysoft Mac Data Recovery supports to recover lost documents, photos, videos, music, etc. from Mac hard drive, external hard drive, USB drive, SD card, memory card and other storage devices on macOS High Sierra 10.13, macOS 10.12 Sierra‎ and Mac OS X 10.11/10.10/10.9/10.8/10.7, no matter those drives are unreadable, unmountable, formatted, or inaccessible.

Tutorial to recover data from unreadable USB drive on Mac

Step 1: Connect unreadable USB drive to Mac.

Step 2: Launch iBoysoft Mac Data Recovery.

Recover data from unreadable USB flash drive on Mac

Step 3: Select the unreadable USB and click Next button to scan lost files on it.

Step 4: Preview the scanning results and choose files we want to recover, then click Recover button to get those files back.

2nd Step: Repair/fix unreadable USB on Mac

After recovering data from unreadable USB drive on Mac, we can repair/fix unreadable USB drive on Mac by reformatting.

Step 1: Launch Disk Utility from Utilities and select the unreadable USB drive.

Step 2: Choose Erase function, complete related information (name, format, scheme), and then click Erase button.

Solution 3: Send the unreadable USB drive to a local technician

Sometimes, the unreadable even can't be found in Disk Utility and thus can't be fixed with Solution 2. Under that condition, the unreadable USB drive is very possible that has some hardware problems. At that time, we can turn to a local technicaian for help.

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