Copying Files To External HDD freezes

Hello to everyone.

A few months ago,I bought an External Toshiba E.Store 3.5" 1.5 TB.I use it on Acer Aspire One-Netbook
Processor Intel Atom1.66GHZ,2gb ram
When I wanted to copy some files,regardless the amount of the files,or their capacitive,the copy just ended well.I use Teracopy.
A bit after,my copy is just freezing.Netbooks is working well,ram was not at high percents,neither cpu.
I had to open Task manager to close teracopy.
Other times, the -file copying- was ended well,other times not.
I did a format to my netbook,because I have searched and I found that maybe on my operating system was the problem.After the format nothing changed.
After a lot of search again,I found that chkdsk may help on the solution of this problem.3 days ago,I pluged my hdd and the *disk checker*(sorry if this is not the name)appeared.
I choose to 1)AutoCorrect file system errors
2)detection and recovery of bad sectors on the disk
(sorry again if this is not exactly what is saying,I'm using win7,greek edition)
This check was going well,but hangs a lot of hours at a sertain number of file.
I stopped the check,restarted windows,and opened Safe Mode to run check here.
Same problem appears.Check hangs at the certain number of files.But my hdd seams to be working,like the blue light is blinking.I saw on a forum that one person had a complete full 2TB external hdd and he took 47 hours to made check done.I am desperate for help,I can't copy a file bigger than 700mb-1gb.

Here is a picture :ImageShack® - Online Photo and Video Hosting
or .
The check hangs at 17075 number of files,language is greek.

Please help me,with that copying problem.I can't copy.
Sorry if I long posted.

I also did from cmd chkdsk /r and hanged at the same number of files,but chkdsk /f completed,but nothing changed