Here is a quick tip, if you wish to perform an unattended download of large files such as Linux DVD ISO file use the wget command as follows:

wget -bqc

=> -b : Go to background immediately after startup. If no output file is specified via the -o, output is redirected to wget-log.

=> -q : Turn off Wget’s output aka save disk space.

=> -c : Resume broken download i.e. continue getting a partially-downloaded file. This is useful when you want to finish up a download started by a previous instance of Wget, or by another program.

This tip will save your time while downloading large ISO file from the Internets.