Patent ID: 6622252
Filing Date: 2003-09-16
Classification: G06F,Y02D

Abstract:
A portable computer comprising:a battery and a connection to an external power source; a two-speed data storage device being supplied power from one or more of said battery and said external power source; and a controller attached to said storage device, wherein said controller reduces a speed and data transfer rate of said storage device, lowers a clock rate for a data channel, lowers tail currents in amplifier stages of a readback amplifier in a read/write module, lowers a power supply for a write driver in said read/write module, and lowers a rotational speed of a hard drive disk connected to said storage device when said storage device is powered by said battery and increases said speed and data transfer rate of said storage device, increases a clock rate for a data channel, increases tail currents in amplifier stages of a readback amplifier in a read/write module, increases a power supply for a write driver in said read/write module, and increases a rotational speed of a hard drive disk connected to said storage device when said storage device is powered by said external power source.