Micropolis Corporation was a disk drive company located in Chatsworth, California and founded in 1976. Micropolis initially manufactured high capacity hard-sectored 5.25-inch floppy drives and controllers, later manufacturing hard drives using SCSI and ESDI interfaces. . Micropolis's first advance was to take the existing 48 tpi standard created by Shugart Associates, and double both the track density and track recording density to get four times the total storage on a 5.25-inch floppy in the "MetaFloppy" series with quad density around 1980. Micropolis pioneered 100 tpi density because of the attraction of an exact 100 tracks to the inch. "Micropolis-compatible" 5.25-inch 77-track diskette drives were also manufactured by Tandon. Such drives were used in a number of computers like in a Vector GraphicS-100 bus computer, the Durango F-85 and in a few Commodoredisk drives. Micropolis later switched to 96 tpi when Shugart went to the 96 tpi standard, based on exact doubling of the 48 tpi standard. This allowed for backwards compatibility for reading by double stepping to read 48 tpi disks. Micropolis entered the hard diskbusiness with an 8-inch hard drive, following Seagate's lead. They later followed with a 5.25-inch hard drive. Micropolis started to manufacture drives in Singapore in 1986. Manufacturing of 3.5-inch hard disks started in 1991. Micropolis was one of the many hard drive manufacturers in the 1980s and 1990s that went out of business, merged, or closed their hard drive divisions; as a result of capacities and demand for products increased, and profits became hard to find. While Micropolis was able to hold on longer than many of the others, it ultimately sold its hard drive business to Singapore Technology, who has ceased to market the brand in 1998. After the disk business sale, Micropolis was reorganized as StreamLogic Corporation, which declaredbankruptcy in 1997 amid securities fraud allegations. StreamLogic's RAIDION line of storage subsystems survive, marketed by the RAIDION Systems division of Peripheral Technology Group. Its VIDEONvideo on demand technology was sold to Sumitomo Corporation. Emerging from the StreamLogic reorganization was yet another company named Hammer Storage Solutions, which was formed from the purchase of the hardware division of FWB, a small Macintosh storage vendor. Its assets were sold in 2000 to Bell Microproducts.
