The Free On-line Dictionary of Computing (19 January 2023):

Dynamic Drive Overlay
DDO

    (DDO) Software to allow a system BIOS
   that does not support Logical Block Addressing to access
   drives larger than 528 MB.

   The alternatives are to update the system BIOS or install an
   EIDE controller card with a suitable on-board BIOS.

   Seagate
   (http://seagate.com/support/disc/drivers/discfile.shtml).

   (2001-03-18)