question about a corrupted huge downloaded file

[rio]

I've tried twice for downloading a huge 600mb file, but they both are corrupted finally though they got the same file downloaded file size. I compare them, and they're both different in binary. I don't know if the downloading file would be corrupted when I click the Abort or Disconnect buttons or disconnected by the remote server or disconnected by my selecting Stop connection from the NIC tray icon, wouldn't it?