Abstract: A semiconductor storage system comprises a semiconductor storage element array including a plurality of semiconductor memory elements, a data bus for transferring data to said semiconductor storage element array, an address bus for inputting an address to said semiconductor storage element array, a read/write controller for controlling read/write of the data written to said semiconductor storage element array, an interface control module for controlling a transfer/receipt of data and commands to and from an outside system, a microprocessor for controlling said read/write controller and said interface control module, a defect address memory for storing and outputting information on an address where at least one defective bit exists and an alternate address to be substituted for said address, and a defect address manipulating circuit for substituting said alternate address for said address where said defective bit exists in accordance with an output of said defect address memory.

Abstract: A spindle motor driving apparatus for a disc device in which in addition to a controller for operating a spindle motor at a predetermined speed, a switch for shorting a current limiting resistor provided between a motor power supply circuit and a driving circuit is closed in response to a predetermined condition after the motor is started.