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6 Solutions to Fix "The Disk You Inserted was Not Readable by This Computer"

"The disk you inserted was not readable by this computer" error message generally occurs when you access an external hard drive on a Mac. But don't worry. Easy and efficient methods to fix the error on Mac are offered here. Download Bitwar Data Recovery for Mac to help if data recovery is required.
Bitwar Data Recovery for Mac downloadBitwar Data Recovery for Windows download

When you got the message: "The disk you inserted was not readable by this computer." you will be unable to access the data in this drive. Actually, "the disk you inserted was not readable by this computer" is one of the most common errors that Mac users have met. Many reasons can cause such an error, including virus infection, file corruption, internal file system errors, faulty connections, Mac malfunctions, upgrading Mac OS, as well as drive corruption. But, don't panic. Just follow the instructions below to fix the problem.

Solutions to fix "The Disk You Inserted was Not Readable by This Computer"

Solution 1. Check the Mac computer

Just connect a different storage device to Mac, if you can see it in Finder, the problem may refer to the external device. So try re-connecting the external device to Mac. Just remove it safely from Mac and then re-plug it. Then, attempt to access it to see if the error persists. If this error still pops up, you could move on to try other ways.

Solution 2. Check the file system format

Check the detailed information of the external device. If it is the file system that Mac isn't compatible with, you can understand why it is unreadable on High Sierra. In this situation, to fix "disk is unreadable" error, you can change its file system.
After the above some basic checks, if error "the disk you inserted was not readable by this computer" still occurs, you should recover the data from the error disk first. Because the solutions next will delete or overwrite the data on the disk,

Solution 3. Repair unreadable external device in Disk utility

You can use the Disk Utility built in Mac to do a disk repair. Disk Utility allows you to format, manage and repair the disk. It's helpful for you to fix many drive issues including the "The disk you inserted was not readable by this computer" error.
Disk Utility's "First Aid" is a Mac built-in tool to verify and repair certain disk problems.
Step 1: Launch Disk Utility.
Step 2: Select the unreadable drive in the left side.
Step 3: Select the "First Aid" tab.

Step 4: Click Repair Disk at the bottom of the screen.

Step 5: After repairing finishes, check to see if Mac reads your external drive.
If Disk Utility reports that the disk appears to be OK or has been repaired, you're done.

Solution 4. Change the drive format

The problem could occur if the drive's format is NTFS. NTFS is not officially supported by Mac. If your drive is NTFS-formatted, you're able to read the drive but not able to write to the drive. And you may get "The disk you inserted was not readable by this computer" error when you insert the drive to your Mac. To fix the problem, you can try to change the drive format to exFAT supported by OS X and Windows.
IMPORTANT: Changing the format of the drive will erase all data in the drive. Before you begin to change the format, back up the files and recover all the data you want from the drive.

Solution 5: Initialize the unreadable external device

If the error still exists, you have no choice but choose the Initialize button. But keep in mind that you will lose all your data on this disk. If you care about files on the disk, you should perform data recovery at first.

Solution 6: Format the disk and restore data

File corruption can cause "The disk you inserted was not readable by this computer" error. And file corruption can be caused by virus infection, a force restart, turning the computer off without doing a proper shutdown, etc. To fix file corruption error, you can recover the data, then perform a format.

Recover data from unreadable external drive

You need to recover important data from unreadable external drive, if you're not sure what third-party data recovery program you can trust, you can do it with Bitwar Data Recovery for Mac. It is reliable & easy-to-use data recovery software that can recover data from unreadable external hard drive, hard drive, USB flash drive, SD card, memory card, digital camera on Mac OS. Besides, it can recover deleted files or lost data from formatted, unmountable, inaccessible, corrupted drive. To recover the corrupted files, you just need a few mouse clicks:

Install the Bitwar Data Recovery for Mac

Free download Bitwar Data Recovery for Mac by clicking download icons below. Then install it on your Mac OS. This software is compatible with OS X 10.11 and later.
Tips: For the latest macOS 10.13 (High Sierra) system requirements, Mac users are not allowed access to system disk from apps. If you want to recover data from the system disk, please disable the system feature "System Integrity Protection (SIP)" , see the guide on How to Disable System Integrity Protection (SIP) in macOS High Sierra (macOS 10.13)

Bitwar Data Recovery for Mac download Bitwar Data Recovery for Windows download

Steps to recover data from External Hard Drive on Mac

Step 1: Select the External Device

Launch the program and connect your external device to the mac, and make sure your Mac recognizes it. Then select it and click "Next".

Step 2: Select the Scan Mode

Choose a scan mode on this step based on the data loss reasons. If you want to recover data from unreadable external drive, choose "Deep scan" and then click "next".
● Quick Scan: This mode can recover deleted files on a partition or device, such as files deleted by command + deleted, emptied from the trash or deleted by other software, etc. If files have not been overwritten by other data, it can be retrieved completely in the condition of the files or directory structures.
● Formatted Recovery: Recover formatted files after performed a quick format on a partition or hard drive in the condition of the capacity of partition or drive hasn't been changed before or after formatting.
● Deep Scan: If the previous scan couldn't work to find lost files, try deep scan this time. Deep scan will search every sector of the hard drive to find all existing files, but the scanning process will spend more time than quick scan and will not have the original file name in the scanning results.

Step 3: Select the file type

Choose the file types you want and click "Next". Bitwar Data Recovery for Mac can effectively and completely recover most file types, such as photos, audio, music, documents, etc. you can choose "select all types" if you have no idea about which file type you want.

Step 4: Preview, recover and save files

After scanning,, you can quickly filter the data by file name and type. You can also preview them to make a selection. Then select the ones you want and press the recover button to have them saved to a safe path very well.
Tips: Please DO NOT save the data into the external device where you deleted it.

Hopefully, this has fixed your "the disk you inserted was not readable by this computer" problem. As a professional Mac data recovery software, Bitwar Data Recovery for Mac can recover data from unreadable hard drive, recover deleted files emptied from Trash, recover data from formatted drive, recover data from lost partition, etc. With it, you don't have to worry about data loss.

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