IRIX operating system uses a large amount of disk space.
A 4GB or 9GB hard drive will obviously enable more projects to be stored. However projects should still be backed up to prevent loss.
Using the Black Hole projects can be backed up to the network or removable devices.
Jaz and 100MB Zip drives are supported by the Pogle Platinum Black Hole software.
Entire projects can easily be dragged from and to the backup device.
Also see removable media drives.
Also ensure that the entire hard drive is formatted as one volume and that there are no partitions. See the SGI system check notes.