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External drive goes read only with error -50 after time

409 Views 12 Replies Latest reply: Dec 3, 2012 8:00 PM by Csound1 RSS
Lucas Holt Calculating status...
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Dec 2, 2012 5:12 PM

Running the special release of 10.8.2 for Mac Mini (2012) that was recently released.  I have two external USB drives.  The first contains my iTunes collection and the second is my time machine backup disk.  The iTunes drive seems to go read only after it's been mounted awhile.  I can read files off the drive, but I can't make any changes.  I can't delete files nor edit them. 


If I try to do anything with the disk including a repair permissions or disk on it, I get an error -50.   The only way to get out of this state is to unmount the drive and remount it forcibly or reboot. 


Anyone have ideas on what is going on or experienced a similar issue?  

Mac mini, OS X Mountain Lion (10.8.2), 2.3Ghz Quad Core (2012)


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