transfer data through windows 7 by copy and paste perfect copy?

Hello,
I have one internal drive with 1 TB.
The data there is very important to me , so I bought External removable drive for backup.
Now, I want to copy the data from one drive to the second drive but I have to be sure I have a perfect copy of the data.
The data is mostly songs movies and documents.
I'm using windows 7.

My question is this:

1.If I'll transfer the data through windows 7 by copy and paste, I could be sure i have a perfect copy?
2.There are tools for comparison Between the original data to the data that was copied?
If so, what are they?

If I do not in the right place please Please pass my message to the right place.thanks.

jonathan.

Copy and Paste would not be much good if it didn't actually do what it says, so YES it works.

Now when you say "perfect copy" ... Whether you know it or not hard drives are formatted into sectors. Files can use from 1 or more sectors, with each sector linked to the next and an EOF (end of file) marker in the last. Any information beyond the EOF is considered random and useless so whether or not that gets copied or not is not consistent (sometimes hackers try to hide code here so if that is your question then go elsewhere). Also sectors on one harddrive may not be the same size as the destination so some restructuring will occur automatically when you copy, so you won't have identical sectors but you will have identical useable data; it will all be there and function exactly the same.

Yes there are tools to compare, see HERE. Try WinMerge.