If you install software from sources like I do, then to build it you obviously need to uncompress it and then install. After a successful installation, re~ove either the tar file or the uncompressed folder. Try to find out the old downloaded ISO images, etc, and delete them i they're not useful. Burn the required ISOs to CD/DVD and then also delete them.

If you're in charge of servers, I'm sure you know tha a large amount of space is used for log files. Logs are very useful to track problems or debug issues. But mas of the time they are unused. Check in your /var/log/ directory to find out the unused log files and compress them using gzip.

Well, that's all for now! But remember, to get good systems performance we need to keep a balance between disk usage and the free space available. Even though you have a hard disk with a high storage capacity, some day you may run out of free space. So remove the unwanted files from the disk and get more free space.