The Toshiba MK1237GSX is a 2.5-inch compact hard drive with Serial ATA II Interface. With a 120 GB storage capacity, this Toshiba Hard drive can hold up to 40,000 MP3 files, 34,000 digital pictures, 14 hours of HD video and 53 hours of DVD quality video. This 120 GB hard drive delivers real density per platter at 123.8 gigabits per square inch, which is considered to be the highest in the industry. With a motor speed of 5400 RPM, this Toshiba Hard drive improves the systems performance and reads and writes data with speed. Being ATA-7 compliant, this 120 GB hard drive allows transfer rates as high as 300 mbps. Ideal for use with notebook computers, the Toshiba MK1237GSX pairs well with GPS system, MP3 players, PDAs etc.