File transfer error deletes whats already copied.

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Hi guys, I have always been bugged about this. Say I am copying a folder from a drive that is going bad. There is 20GB and it gets 3/4 of the way thru and there is a problem. I hit okay, and then it removes everything it's already copied. Is there a way to stop that from happening so I can atleast keep what I have already got? Thanks!
 
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Is this one 20gig file or just 20 gigs in general?
If the second then yes, you can.
 
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You can do this in Terminal.
Say you have a folder full of files. You can use the cp command.
You have to know exactly where the folder is and exactly where the drive is you're copying to.
For example: In your Home folder is a folder named stuff you need to copy. It's going to a drive named newdrive.
You would open Terminal and type:
cp -R stuff /Volumes/newdrive/stuff
The -R switch tells cp not to stop if there is an error like Finder does. It also makes cp copy everything in that folder, and subfolders, etc.
If this is a little over your head you might want to get local help from someone knowledgeable in Terminal and/or linux.
 
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Thank you but what I meant was, is there a way to set Finder to not erase everything it copied should it be stopped by an error for all processes. This computer is for a customer, so I won't be there to get around it for them. Thanks again!
 

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