My new model iMac running 10.9.4 cannot recognize my external Seagate hard drive formatted in NTFS (4TB USB 3.0). I’ve tried manually mounting it via Disk Utility. It said “The disk could not be mounted. try running First Aid on the disk and then retry mounting” I haven’t tried First Aid, it also said I could try verifying the disk but haven’t done that for the same reasons. The hard drive works fine on my 2009 iMac. Checked Finder preferences - external discs are allowed to appear on the desktop and Finder sidebar. I used NTFS-3G, but it didn’t seem to do anything. The only place I can see my hard drive is in Disk Utility, but it is grayed out. I don’t want to erase or change anything on the hard drive. Can anyone help me? Thanks.
NTFS drives are read-only on Mac. If you even can’t access and mount the NTFS drive on your Mac, your drive must be corrupted. Just reformat it to exFAT or APFS to enable it readable again. This inevitably causes data loss.
Hi, guy, from your description, it seems that the file system NTFS on your external hard drive is corrupted, making your external drive cannot be mounted on your Mac. Reformat the drive is the only way to make it readable and writable on the Mac. You say that you don’t want to lose anything on the hard drive. There are diverse data recovery tools on the website, like iBoysoft Data Recovery for Mac. You can use it to rescue files on your unmounted external hard drive and then erase the drive to make it workable again.
Download, install, and open iBoysoft Data Recovery for Mac on your iMac.
Select the external drive on the app’s main interface and click Search for Lost Data.
Wait for the scanning process to complete.
Check the scanning results, choose your wanted files, preview them, and then click Recover to save them to your Mac.
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