My 4TB WD passport drive - MS-DOS (Fat) that I have had for about 2 years suddenly stopped mounting on my 2015 Macbook Pro but WORKS FINE on a one-year-old iMac. Neither NFTS for Mac nor Apple Disk Utility will mount it. Restarting the computer has not worked. Using a different USB port has not worked. Other USB external drives to the same Macbook Pro mount and work fine. Why is this happening? How do I fix this?
Any suggestions?
input/output error sounds generic, but is actually VERY specific.
I/O error is caused when Bad Blocks are encountered on a drive, and re-reading with the drive's error correction up to 1,000 times did not yield correctable data.
From the report you posted the boot blocks are in a Bad Block, and if you do not have an adequate backup, your Volume and all the files on it are lost.
But it mounts fine on a newer Mac and shows all of my files. So it seems the problem is not with the external drive but with my Macbook Pro not being able to read it now although it could the last time I plugged it in. Is my assumption accurate?
If you have a way to get the files off this drive, and copied to another drive, I recommend you do so as soon as possible.
From the information I could find on FAT, its is a floppy disk format intended for Volumes under 32 M Bytes in total size, and your setup is a time bomb waiting to blow up in your face.
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If you want to use something like this, a little better grounded in reality, AFTER you copy all the files off it, reformat the drive as exFAT.
com.apple.DiskManagement.disenter error -119930868
