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Computer disk file space

Your computer needs lots of space for temporary files, for many purposes. Many jobs like writing to a CD or DVD, or backing up the computer files, require a lot of space. Usually in excess of 2 Gigabytes. Don't forget that Windows needs space for your own temporary files, system restores, and many other purposes. If you have less than 20% of your disk space available, Windows may not be able to "defrag" the disk.

You may experience memory-related problems with a full drive, because Windows uses the drive to temporarily store memory contents. Here are common uses of your disk space.

  • Burning a CD or DVD: Files are written to the hard drive as you are accumulating your list to write to the media.
  • Downloading from the net: Files are typically written to a temporary directory, then moved to wherever you specified.
  • If you have less than 20% of your drive available as "free space", your defrag program might not work. If your disk is not defragged, or if you have less than 1 Gigabyte of disk space available, your virtual memory and temporary files might not work properly, causing "weird" errors- the ones nobody else seems to experience, but you do. When Windows needs more RAM than is physically installed, it uses the hard disk memory as virtual ram. If you don't have enough free disk space available, Windows may not be able to use virtual memory, and so it will slow down noticeably.