SP/Silicon Power Releases the Brand-new USB 2.0 OTG Flash Drive—Mobile X21 360° Swivel-Cap Design, One-push Backup SP/ Silicon Power, the world’s leading provider of memory storage solutions, today releases the brand-new USB 2.0 OTG flash drive—Mobile X21. Engineered with the dual-interface of a micro-USB and a USB 2.0 August 19, 2014 News