A data processing system comprises a Flash memory (120) having a storage space partitioned in a plurality of storage pages (P′). Each storage page comprises a memory reliability indicator indicative for the reliability of a storage region of the memory. Coupled to the Flash memory is a controller (150) for the Flash memory, that includes a facility for protecting data against errors occurring during storage in the Flash memory and for detecting and/or correcting errors in the data stored in the data, when retrieved from the Flash memory. A data processing unit (100) is coupled to the controller (150) that has access to a working page (P) comprising a first section of user data and a second section of management information, including a memory reliability indicator. The data processing system is characterized by a data re-arranging facility (105) for subdividing the data in the work page into a plurality of portions. Each portion comprises a part of the user data, and the last portion additionally comprises the management information including the memory reliability indicator. The controller (150) is arranged to subsequently generate redundant data for each of those portions and to write the content of the subsequent portions with its respective redundant data to the storage page (122).