Sunday, May 24, 2015

macos - Copy files from external hard drive that Disk Utility can't repair

I have a 2 Tb WD MyPassport Ultra external hard drive containing lots of important data, and a Macbook Pro running OS X 10.9.5. The harddrive fell while pulling down lots of data via wget, and now seems to be corrupted. I tried ejecting the drive (had to Force Eject because it thinks it's in use elsewhere) and rebooting my computer, but that didn't solve the problem. Here's the Disk Utility log:


2016-05-08 21:51:00 -0400: Verify and Repair volume “disk1s3”


2016-05-08 21:51:00 -0400: Starting repair tool:


2016-05-08 21:51:00 -0400: Checking file system


2016-05-08 21:51:39 -0400: Volume repair complete.


2016-05-08 21:51:39 -0400: Updating boot support partitions for the volume as required.


2016-05-08 21:51:52 -0400: Error: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.
2016-05-08 21:51:52 -0400:


2016-05-08 21:51:52 -0400: Disk Utility stopped repairing “disk1s3”: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.


Fine, I need to backup my files. The problem is that I can't copy any of the files on the disk -- when I try with cp on the command line, or with copy/paste in Finder, I get


Input/output error


and it creates a 0byte file with the name of whatever I was trying to copy. How can I safely copy the hard drive data somewhere so that I can reformat the disk?? Please give options other than buying some expensive data recovery software if at all possible.

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