Patent ID: 7953950
Filing Date: 2011-05-31
Classification: G06F,G11C

Abstract:
1. A storage device comprising: a semiconductor memory including a flash memory storing data, said flash memory including a plurality of recording units composing an allocation unit; a controller instructing to write data to the semiconductor memory in accordance with a request the controller receives; a first register provided in the controller and holding performance class information showing one of performance classes classified by performance, the one of performance classes indicating that the storage device guarantees minimum performance specified by the one of performance classes; and a second register provided in the controller and holding performance parameter information relevant to performance of the semiconductor memory and the controller, wherein the storage device is configured to output the performance class information in response to an instruction from an outside of the storage device, and the performance parameter information includes information for computing performance to write data into one of said recording units which prior to writing data stores no data.