Patent ID: 8103846
Filing Date: 2012-01-24
Classification: G06F

Abstract:
1. A memory management unit for an information processing system, comprising: a controller to control data writing; and a non-volatile memory used for storing both non-rewritable data and rewritable data required to be read and written at a given timing, the non-volatile memory being managed by a file system and partitioned into a plurality of partitions including a read-only partition and a rewritable partition, the read-only partition storing the non-rewritable data including program data to be used when activating the information processing system, and the rewritable partition storing the rewritable data including apparatus-specific data, the apparatus-specific data further including access-restricted data required for activating the information processing system, and the access-restricted data is prohibited from being written during normal usage but is writable at specific times, wherein the non-rewritable data, stored in the read-only partition, is protected from an abrupt power shutdown occurring when rewritable data is being written, and wherein the controller stores the access-restricted data to the read-only partition by changing an attribute of the read-only partition of the non-volatile memory from a read-only attribute to a rewritable attribute.