I can not transfer files and data from macbook pro to my external hard drive, i can not transfer files and data from macbook pro to my external hard drive , so what should i do ?

i have an external hard disk but whenever i tried to transfer any file or data from macbook to this ext.disk its failed before that i used to have another hard drive with same problem ,then i thought may  be this hard drive is not support mac then i bought a new one which supports mac but still i have same problem what should i do ?

Ok.
Go into Disk Utility, and make sure you select your external hard drive.
There should be 4 tabs, one being erase. I have taken a screenshot to show you what it should be set to (obviously name it what you like), and set the format to Mac OSX Extended (Journaled) as per the example below & after double checking your in the right drive, you can hit erase. And you're done! *hopefully*

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