Plus Development Corporation was a majority-owned subsidiary of Quantum Corporation. The company invented the Hardcard, a hard disk drive on an expansion card, which started a wave of companies producing similar products in the 1980s. History Quantum Corporation specialized in making sophisticated and expensive hard drives for minicomputers. Plus Development was formed in October, 1983, by a handful of Quantum employees, led by Stephen Berkley (President), Dave Brown (Engineering), and Joel Harrison (Architecture), based on a conversation over dinner between Nolan Bushnell and Quantum President James Patterson that Quantum needed to start building products for the end user market. Their goal was to provide a simplified upgrade path for the newly released IBM Personal Computer which did not come with a hard drive. The company was originally incorporated as BBH Corporation (using the initials for Berkley, Brown, and Harrison), but also used the name Bits in Space for fun. It later changed its name to Qew Corporation (a pun on the first initial of Quantum), finally ending up as Plus Development Corporation. Product development Over the two years after Plus Development was launched, the team was working on some major industry firsts: A hard disk that installed in an ISA PC card expansion slot (not a PCMCIA slot not invented at that time) Host controller integrated with the hard disk printed circuit board (PCB) A drive controller chipset cheaper than any previously built Hard drive thickness of only 1 in Consumer-focused installation of a hard disk Competition Within one year of the Plus Development introduction of Hardcard, 28 companies had released similar products. At that time, all of the other products were using a standard hard drive with a 1.6 inch/40.6 mm height forcing the card to hang over the adjacent PC slot. The hard drive was located on the opposite side away from the connector sometimes enabling a short half-length expansion card to be installed in the adjacent slot. These hard drive cards were usually described as occupying 1.5 expansion slots. Below are some of companies and product names with a similar product to the Plus Hardcard. JVC (Japan Victor Company) Kamerman Labs, (Beaverton, Oregon) – Slot Machine Maynard Electronics, (Casselberry, Florida) – On Board Microscience International Corp, (Mountain View, California) – EasyCard Mountain Computer Inc., (Scotts Valley, California) – DriveCard Qubie Distributing, (Camarillo, California) – Hardpack Tandon Corporation, (Chatsworth, California) – DiskCard, Business Card Verbatum Corporation, (Sunnyvale, California)