When I run the disk utility to veify it, I receive the following message: "Verify volume failed with error Could not unmount disk". I can copy things on it but I can't read them. When I acquired my Mac I backed it up and reformated it in HFS+ (journaled) from the previous NTFS file format and then. I have been using my Hitachi USB2 harddrive on windows XP without any problem. You can download it now to preview files on the unmountable drive for free.I've just switched the the wonderful Mac world but I have an issue with my exWindows external harddrive. I used it before to retrieve data from an uncountable external SSD on my MacBook Air and it was able to recover all of them. It's also fully compatible with all macOS versions released after OS X 10.10 Yosemite, 2014. It's easy to use and has an excellent recovery rate. It can recover data from unmountable drives formatted with various file systems on Mac, including APFS. IBoysoft Data Recovery for Mac is highly recommended for such data recovery. Therefore, if the volume has data that' essential to you, you should recover them first. It's worth noting that formatting the drive will erase all data on it. You can reformat the drive to resolve the issue. Suppose the volume still won't mount, then it likely has file system corruptions. Then replace disk_identifier in the following command with it and run the command. Pay specific attention to the identifier of the unmountable volume. Terminal will return information about the internal and external hard drives connected to your Mac. If that doesn't work, open Terminal and run the following command to mount the volume. I recommend you try rebooting your Mac with the external drive connected. If you couldn't mount the volume in Disk Utility and received " File system verify or repair failed.:(-69845)" when repairing it using First Aid, the issue may be caused by a temporary system glitch or file system corruption.
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