When using Windows 95’s Disk Defragmenter (DEFRAG.EXE), be sure to disable your screen saver. If the saver kicks in while the Defrag program is running, the system may lock up and/or reboot. This creates the remote possibility of serious file damage. The same goes for running Windows 95’s ScanDisk (SCANDISK.EXE). It may not cause file damage, but it will want to start over since it will think files have changed. At the very least this could cause an endless loop of restarts. The bottom graphic shows what you will see if anything changes on a drive while Defrag is in progress. This makes a good case for why these maintenance chores are best scheduled during off-hours or at night.