External Hard Drive will not copy/open files.

Today, I went to edit photos on my iMac. I have a 1tb G-Drive Mobile that I have been using lately to store photos/videos on. I last used the hard drive this past friday, 4/4/2014. When I opened Lightroom to open my photos the whole program froze. I them went to the hard drive to see if there was something wrong with the folder and I soon found out that I was not able to open any files on the hard drive. I can see all the folders and individual files on the hard drive in finder but I am unable to open/copy/ or view any of these files. Every time I attempt to open/copy a file my whole computer freezes. Once I unplug the hard drive (w/o ejecting) everything goes back to normal. I have absolutely no idea what is going on. It worked fine one day and the next it doesn't function. I have tried using it on 2 MacBook Pros and my iMac and same result with all three computers.
Any help would be very much appreciated.
Thanks,
Jaison

when I tried to copy all files
Exactly which files did you copy?
Quit iTunes.
Copy the entire /iTunes/ folder frn one external to the other.
Hold Shift, launch iTunes.
Select Choose library... and select the iTunes folder you want on the external.

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Further update ....
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2015-01-21 10:49:18.671 iPhoto Library Manager 4.1.11; iPhoto 9.6; OS X 10.10.1; unregistered
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2015-01-21 10:49:19.042 Photo transfer settings: source libraries = /Volumes/Pictures/iPhoto Library, copy faces = true, copy places = true, combine album contents = false, photo attributes copied = (comment, date, flagged, hidden, latitude, longitude, name, rating)
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<Edited by Moderator>

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Drive Partition and Format
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hi there,
in your case, your drive is probably bad because the copy was interrupted. your hard drive may be finished, but more likely, just the file structure is damaged and/or you have bad sectors.
you have a few options:
*if you don't need the data back:*
• see if the drive appears in disk utility and try to erase/reformat (make sure to zero out data to avoid bad sectors)
• if it doesn't appear, try a pc. it won't recognize it, but it may allow you to reformat/initialize it. then, connect back into mac (which will recognize a pc formatted drive) and reformat as mac os x extended (journaled).
*if you need the data back:*
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• if you aren't successful, you may want to try a professional data recovery service (or me first, to ensure that you actually need someone as high tech as drive savers)
• if you are successful and are able to recover the data, then erase the drive (zero out data) and then move the data back, to ensure you're working off a well formatted drive.
fyi, if your computer freezes in the future, be sure to try appleoptionesc first and force quitting the problem application. if that doesn't work, try controloption+appleeject (shutdown) and/or optionappleeject (restart). if those doesn't work, in this situation, the next best move would probably have been turning off the power on the hard drive. if that doesn't unfreeze the system in a few minutes, then hold the power button.
hope this helps,
brian
corewerkz/briancometa.com/

External Hard Drive will not copy/open files.

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