SEMICONDUCTOR STORAGE SUBSYSTEM

PURPOSE: To shorten fault recovery processing time by providing a semiconductor control device with a means for initializing a track table (TTL) at the time of executing an instruction applied from the external or executing a format writing command when the TTL is failed. CONSTITUTION: When a semiconductor storage control device(SSC) 502 receives a format writing command 510 and a TTL fault is generated on an indicated track, the TTL is initialized by TTL initialization 511. When a fault is generated in the TTL 505, the fault generation is informed to the SSC 502 by a fault report 508. After receiving the fault report 508, the SSC 502 informs the fault generation to a CPU 501 by a fault report 509. A maintenance man finds out a failed track based on the report 509 and the initialization of the TTL 505 is requested by a service processor(SVP) 503. Receiving a TTL initializing instruction, the SSC 502 initializes the TTL 505 and track data 506 stored in a semiconductor storage unit(SSU) 504.