DDO may refer to any of the following:

  1. Short for dynamic drive overlay, DDO is a TSR that loads onto sector two of a hard drive. Used with computers that do not support LBA mode, DDO allows a computer to recognize and support drives larger than 520 MB.

  2. Short for Dungeons & Dragons Online, DDO is an online card game based on DND.

  • Why am I unable to see the full amount of a hard drive?
  • Hard drive help and support.

Computer acronyms, Game terms, Hard drive terms

  • The official Dungeons & Dragons Online website and download.