Strengthening its line up of portable 1.8-inch hard drives for external use, Samsung announced its 250 Gigabyte (GB) 1.8-inch hard disk drive, the Spinpoint N3U which incorporates a native USB 2.0 controller on its printed circuit board. Most external hard drives require the addition of a bridge circuit board to convert the hard drive's current interface into a USB interface. Samsung's N3U drive, however, uses a native USB interface and as such does not require this bridge board. This optimized design results in a smaller foot print, less power consumption and optimized performance, which is ideal for portable external storage devices. The Spinpoint N3U also comes in 120 GB, 160 GB, and 200 GB capacities, the disk rotation speed is 3600 rpm. The drives are equipped with an 8 MB of cache memory.