External Hard Disk & Macbook Pro

hello,
Ok enough searched so far, now I would like to know the reason that why i can not copy stuff form my Macbook Pro to External HD & what is the best possible way to get rid of it , keeping in mind i need to use External HD on windows as well.
Thanks & Regards

The best solution is to format the hard drive for the following reasons:
1) You are not reliant on third party software
2) It will work on any computer and OS known to man
3) In the long run it is the easiest way to do things
Time Machine is the best solution to backing up your Mac.... Using Time Machine means that when your hard drive fails (not if, but when) you can quickly recover all your important data onto your mac.
Realistically yes the prior comments are correct, you don't "Have to" format the drive, BUT, in the long run thats your very very best option..
Also worth noting, being an Apple Authorised Technician, I face these issues almost everyday....

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