http://www.macrumors.com/2008/05/27/samsung-announces-fast-256gb-solid-state-drive-ssd/
With a sequential read speed of 200 megabytes per second (MB/s) and sequential write speed of 160MB/s, Samsung’s MLC-based 2.5-inch 256GB SSD is about 2.4 times faster than a typical HDD.