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Try fixing permissions. First, Get Info for the hard drive in question. Make sure that the User that you are signed in with is listed as able to read and write. Also, open Disk Utility and repair the permissions on the drive.

If that doesn't work you can use special software such as DriveWizard for Mac, which is designed to read data from damaged drives. You can download it from: http: //drivewizard.for-mac. com

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Q: How to repair a disk that cannot be read or written on a MAC?
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