Input/output error when attempting to restore external HDD?

I have an old 1TB external HDD that corrupted a while ago, the drive still mounts and i can still see the files inside the drive, unfortunately opening the drive up crashes finder. As i have another 2TB external drive, my next idea was to create a second partition in my 2TB drive and then restore the old 1TB drive into the second partition of the 2TB drive using the disk utility. After a few minutes it comes up with the error message INPUT/OUTPUT error and then stops restoring it.
Any ideas folks as to where to go from here? what the problem might be? or what to try next?
many thanks
Ali

Ali,
your external 1 TB HDD might have a hardware fault which is preventing access to its files. Have you tried running your MacBook Pro’s Apple Hardware Test, to see if it can detect a hardware-related problem with your external 1 TB HDD?

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