Patent ID: 8189412

Claim:
A storage device comprising a plurality of semiconductor memory packages, each being mounted with a semiconductor memory, mounted on a printed circuit broad via a joining portion, the storage device comprising: a sensor that measures a physical quantity relating to a state of the storage device; a database that accumulates a damage estimation model base to be used for estimating damage of the joining portion from the physical quantity; a damage estimating unit that calculates an estimation value of a damage of the joining portion from the physical quantity using the damage estimation model base; a controller that selectively controls writing, reading, and erasing of electronic data to and from the semiconductor memory mounted on the semiconductor memory packages that are mounted via the joining portion according to the estimation value; and a semiconductor device for controlling memory, which stores an operating system and I/O information, wherein when the estimation value exceeds a predetermined range, the controller moves or copies the operating system and the I/O information stored in the semiconductor device for controlling memory to other semiconductor memory or to another storage device.