Brocade integrated BLOOM into its first "pure" director, the SilkWorm 12000, in April 2002. The director offered up to 128 ports in two 64-port pseudo-switches ("domains"). The 12000 represented several internal architecture and technical changes besides the new ASIC: it had an upgraded control processor architecture (Intel i960 moved to PowerPC 405GP), changed the embedded operating system (FOS v4.0 migrated from Wind River Systems VxWorks to MontaVista Linux), and introduced the backplane architecture (hierarchical PCI buses with replaceable blades attached to a backplane). The Bloom ASIC also introduced a notable capability of frame-level Fibre Channel trunking, which provided high throughput with load balancing across multiple cables. It needed to be implemented in the ASIC hardware to ensure in-order delivery of frames. Also hot firmware upgrade was introduced with FOS v4.1 in October 2003. At the time, Brocade's main rival, McDATA, held over 90% market share in director segment, owing to a strong position first in the ESCON market, and then in the FICON market. The SilkWorm 12000 director gained over one-third of the market share after its release in 2002. Brocade added mainframe customers with FICON and FICON CUP support on the SilkWorm 12000. In 2003, the SilkWorm 12000 was named “Storage Product of the Year” by "Computing". In 2004, the BLOOM II improved on the previous ASIC design by reducing its power consumption and die size, while maintaining 2 Gbit/s technology. It powered Brocade's second generation director, the SilkWorm 24000. Still a 128 port design, it was the first one which could operate as a single 128-port switch (a single domain). The new director also used approximately two thirds less power than its predecessor. Brocade introduced also its first multiprotocol Fibre Channel router, the SilkWorm 7420. Brocade also acquired Rhapsody Networks (a SAN virtualization startup company). This was also the time frame in which Brocade first entered into the embedded switch market, delivering multiple switches physically integrated into other vendors' hardware, such as storage controllers and blade server chassis. As of March 2009, Brocade had sold over 10 million SAN switch ports with over 44,000 directors installed, and held 75.5% of the overall SAN switch market (Dell'Oro Group, 1Q09 SAN Report).