Patent ID: 7469571

Claim:
A data storage device comprising: plural storage units as closed structures each of which houses a storage medium disk therein, the storage medium disk being capable of moving relative to a head for access; an external force detection portion for outputting signals corresponding to external forces applied to the storage units in plural directions; and a controller for controlling the storage units, wherein the storage units are arranged in such a manner that surfaces of the storage medium disks are each parallel to surfaces of at least one other storage medium disk and the storage units are wholly or partially different from one another in a direction of relative movement between the storage medium disk and the head, have a substantially identical structure to each other and each of the storage units includes an acceleration sensor for detecting an external force, and the controller has information indicating a relationship between each of the storage units and directions of external forces against which each of the storage units has good impact resistance, determines whether each of the storage units has good or poor impact resistance based on the information and the signal outputted from the external force detection portion, selects from among the storage units one or more of the storage units having the good impact resistance, and makes the selected storage unit or storage units perform an access operation.