A LD-ROM is a data storage format extension of the laserdisc. A LD-ROM could store sixty minutes of analog audio and video with 540 megabytes of digital data where the digital audio soundtrack would be.
This format was used mainly by the Pioneer LaserActive interactive laserdisc player/game console, which had several video games available for it in the LD-ROM format.
An earlier, but essentially identical, version of LD-ROM developed by Philips called LV-ROM (LaserVision Read Only Memory, "LaserVision" being Philips' own brand name for the laserdisc technology), was used for the BBC Domesday Project for the storage of analog video/audio and digital data on a laserdisc. The data area of the disc was read by a special Philips LV-ROM drive connected to a BBC Master computer, and then processed and overlaid by way of genlock by the computer as text & menus over the analog video from the disc.