SpeedPlus power speed technology for 22X writing - Powerful over-speed support. Low noise and vibration control system for high speed. Optimised algorithm for fastest speed. Prevents buffer under run error and enables high speed writing - Buffer Under Run occurs in high speed writing, when speed is faster than data transfer speed. Buffer Under Run technology prevent the Buffer Under Run Error and it enables Multitasking on the PC. Supports high speed writing even in low performance PC. Internal/External - Internal