This week we see a mobile phone Toshiba W41T which has built in 4GB Micro Hard Drive. Currently Toshiba is targetting to boost the capacity to 10GB range.

Toshiba Storage Device Division announced it will extend its perpendicular magnetic recording (PMR) leadership to the 0.85-inch hard disk drive, enabling capacity around the 10GB level with industry-leading areal density targeted at 200 gigabits per square inch.

Incorporating Toshiba's breakthrough PMR technology onto the world's smallest HDD will transform mobile phones into complete entertainment and information devices with music, video and GPS mapping. In addition, this thumb-sized, high-capacity drive will propel the continued miniaturization of digital music players, handheld GPS systems and other devices, while increasing capabilities for more music, video and maps.

Noted as the world's smallest HDD in the Guinness World Records book, Toshiba's 0.85-inch HDD is currently shipping in a 4GB capacity. The company will now extend PMR to the 0.85-inch form factor with plans for high-capacity drives in 2007.

The hard drive is currently used on Toshiba W41T for Japan network.