' The disk you attached is not readable by this computer' can also be caused due to an outdated driver on your Mac. If this error still occurs, please move on and try the following solutions. Then, attempt to access it and see if the disk you attached is not readable by this computer on Mac, still. Just safely remove it from your Mac and then re-plug it. You can try simply reconnecting the external storage device to your Mac. It is a simple process that is slightly different depending on the Mac hardware. If you're confident the USB port is a problem and not the device itself, the first thing you should do is reset System Management Controller (SMC). In this case, change another USB cable or USB port and try again. Sometimes, a USB cable or USB port is something wrong so that the disk you inserted is not readable by this computer. If this error continues, try other solutions as below. Plug this unreadable disk into another computer (Windows or Mac) and check if it can be readable. After initializing it, this new hard drive will be working. If it is a new hard drive, click the "Initialize" button to initialize this drive after seeing the unreadable disk error. For example, the ReFS file system is not supported by macOS. If macOS isn't compatible with this file system, the disk you inserted is not readable by this Mac. In this case, try iBoysoft BitLocker for Mac to access the BitLocker encrypted drive on Mac.Ĭheck if the file system is not supported by macOSĬheck the file system of the external drive to see if the file system is supported by macOS. If you receive the disk not readable error after inserting an encrypted drive, you need to open this drive with the corresponding app.įor example, if the disk is encrypted by BitLocker, macOS also reports "The disk you attached is not readable by this computer" without BitLocker for Mac tool installed. There are six methods to do basic troubleshooting and determine if the unreadable disk (External hard drive, SD card, USB drive, flash drive, etc.) has a problem: Here we offer 8 methods to fix The disk you attached that is not readable by this computer issue on your Mac, you can try them one by one until the unreadable problem has been fixed. How to fix The disk you attached is not readable by this computer on Mac No matter whether you're facing The disk you attached was not readable by this computer or The disk you inserted was not readable by this computer, you can try the below fixes to repair the unreadable USB on Mac. Most of the time, this issue happens on macOS, but it also occurs on Mac OS X with this message - The disk is unreadable by this computer, do you want to initialize the disk? It will display: The disk you inserted was not readable by this computer. While if you're using a Mac computer installing Catalina, Mojave, or High Sierra, the non-readable error message is slightly different. As a result, you can't access the files on this storage device, and this pop-up only offers you 3 options: Eject, Ignore, and Initialize. If you're using macOS Ventura, Monterey, or Big Sur when you connect an external drive, an SD card, or a pen drive to your Mac computer, an error message pops up: The disk you attached was not readable by this computer. The disk you attached was not readable by this computer, what is it FAQs about The disk you attached was not readable by this computer How to avoid disk not readable error again Why does Mac say The disk you attached was not readable by this computer In this post, we give 8 feasible methods to fix the disk unreadable error on Mac. If you're the one who encountered the disk not readable error, then, you've come to the right place. While others say this unreadable disk error only appears with one external drive. Some affected users report the issue occurs with every external drive. It seems that this disk unreadable error could also occur on macOS 14 Sonoma, macOS 13 Ventura, macOS 12 Monterey, or macOS 11 Big Sur. Many Mac users are experiencing " The disk you attached was not readable by this computer" error when connecting an external hard drive, SD card, or USB flash drive to their Macs with Catalina, Mojave, or High Sierra installed.
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