Qualstar Corporation is an American manufacturer of magnetic tape data storage products, based in Simi Valley, California. It was founded in 1984 as a 9-track tape drive manufacturer, and now makes tape library products. The company sold its last 9-track tape drive in 2006 and as of March 2006 has sold all remaining parts inventory to Vinastar, an aftermarket vendor. Qualstar announced the TLS-4000 Series tape library family in 1994 and began shipment in 1995. Initially using Exabyte 8mm tape drives, the TLS-4000 Series was the first library product line to automate Sony's popular AIT drives. Leveraging the basic TLS design, Qualstar subsequently introduced the TLS-6000 Series for DLT and SDLT drives, the TLS-5000 Series for Sony SAIT drives and the TLS-8000 Series for LTO drives. The TLS-2000 Series for 4mm drives was also produced for a limited time. By 2011, only select models of the TLS-8000 family remain in production. In 2001, the company introduced the first RLS-Series of rack mountable tape libraries. A number of models supporting AIT, SAIT, SDLT and LTO tape drive technologies were produced. The RLS-8000 Series for LTO technology continues in production. Wikipedia