Patent ID: 8281161

Claim:
A data accessing apparatus applied for in a processing system which has a bus control unit for transacting a first bus data having a first bus interface format, a first power supplying unit for supplying a first power signal, and at least one storage media for storing a second bus data having a second bus interface format, comprising: a first bus channel for being electrically connected with the bus control unit to transmit the first bus data; a second bus channel for transmitting a third bus data having a third bus interface format and supplying a second power signal generated from a power source independently of the first power supplying unit; and a bus signal switching and conversion unit which permits an electrical connection only between the first bus channel and the storage media and performs a format conversion between the first and second bus interface formats for a data transmitted between the first bus channel and the storage media and supplies a system power based on the first power signal to the storage media if the bus signal switching and conversion unit receives a control signal at a first level, and permits another electrical connection only between the second bus channel and the storage media, and performs a format conversion between the second and third bus interface formats for another data transmitted between the second bus channel and the storage media and supplies another system power based on the second power signal to the storage media if the bus signal switching and conversion unit receives the control signal at a second level.