Patent ID: 8037275

Claim:
A memory module system, including: a serial presence detect (SPD) memory configured to store first SPD data and second SPD data of a memory module, the SPD memory being partitioned into at least two regions including a first region storing the first SPD data and a second region storing the second SPD data, the second SPD data initially being identical to the first SPD data; and a memory controller configured to boot the memory module system based on a comparison between the first SPD data and the second SPD data when an initialization signal is input to the memory module system, wherein the first region is configured to perform only a read operation by being locked after the first SPD data is written to the first region, and the second region is configured to perform a read operation and a write operation, and wherein the SPD memory is located in a memory module, the SPD memory stores information about a plurality of memories included in the memory module, and the memory module is different from the memory controller.