Error with this external Drive Help!!!

Hi experts ,
I purchased a new External Drive manufactured by Seagate FreeAgent GoFlex Desk, which is 1TB in size. It worked well when I plugged it into my old laptop but when I clicked on the drive there was a dialog box saying, "The request could not be perform because of an I/O error." I tried it in my desktop computer and it was working good. I was even able to copy my files, install the GoFlex software, and backup some software too. Then I tried it again with my laptop but still it's not working. Can someone please tell me what seems to be the problem? All of the other flashdrives are working fine, so why does my External Drive commits error?
Thanks in advance .
