Solve ‘The disk you inserted was not readable by this computer’ Error


USB drives are no doubt a very useful type of storage device and one that is pretty reliable. But what is important to understand is that USB devices also do experience issues from time to time. And most issues that occur with USB’s are related to the device becoming inaccessible or corrupt. And one such related error ‘The disk you inserted was not readable by this computer’ will be discussed in this blog post.

What causes the error ‘The disk you inserted was not readable by this computer’?

  • File system corruption or bad sectors often caused due to removing the device abruptly when in use
  • Turning OFF the computerin the middle of transferring files to and from a USB drive
  • USB disk failure
  • Virus attacks

Solutions to resolve the error ‘The disk you inserted was not readable by this computer’

Before you actually begin with the troubleshooting steps to resolve the error ‘The disk unreadable error’, let’s try some quick tricks. First, connect the USB drive to another USB port and check if it works. If it does, then you know the USB port has some issue and hence the error.

Next, you can also connect the USB drive to another Mac to check if it works. If it works, your Mac probably has some issue. This way you can identify where the problem is coming from.

1. Repair USB drive using Disk Utility

If you receive the error ‘The disk was not readable’ after connecting a USB drive to a computer, then it means your computer is unable to read files on the USB.

To solve this error, first click on ‘Ignore’ in the error message screen and then run First Aid using the steps below.

  • Then go to Applications > Utilities > Disk Utility
  • When inside Disk Utility, choose the USB drive (from the left menu) that is displaying the error message
  • Click First Aid > Run

Wait until the First Aid process completes. If you receive a First Aid successful message, it means the inherent errors are resolved and you are all set. If you receive a ‘First Aid has failed’ message, you can try the other solutions.

2. Recover data and re-format the USB drive

If First Aid doesn’t resolve the error, then you should consider formatting the drive to resolve any corruption issues or incompatible file system issues. Before you do so, recover data from the USB drive as the format process will delete everything on it.

Step 1: Yodot to the rescue

You can make use of Yodot to recover data from flash drives displaying the error ‘The disk is not readable’ or recovery from unreadable flash drives. This tool is designed to recover all kinds of files like Word documents, Excel files, PDF’s, photos, videos etc.

This tool can not only recover data from USB flash drives, but it can also be used to recover data from corrupt hard drives, SD cards etc.

Step 2: Re-format USB drive

Once you have recovered data from the USB drive, go ahead and format it to resolve the error. To format the USB drive, follow the instructions below.

  1. Click on the Mac Finder > Applications
  2. Then go to Disk Utility. From the list of available drives on the left, select the USB drive displaying error
  3. Click on the Erase button found in the top menu bar
  4. In the Erase window that appears, assign a name and a file format for the USB drive
  5. Finally, click the Erase button

Now the USB drive will be formatted and should be recognized by your Mac system. We hope that one of these solutions helped you resolve the error The disk was not readable.