Abstract: A multi-format card read/write optical disc drive comprises a micro-controller for processing actions between each component. The micro-controller is connected to a read/write drive, a multi-format card read/write controller, a data codec (coder/decoder), an analog interface transducer, and a computer interface controller. Through the read/write drive and the multi-format card read/write controller, read/write actions are performed to an optical disc and memory cards of various formats, respectively. The data codec is used to decode compressed media data and encode raw data for compression. The analog interface transducer-receives a digital data decoded by the data codec and then converts them into an analog signal for output. The computer interface controller is used to provide connection with a computer for performing bi-directional communications with the computer.

Abstract: A method is suggested for accessing a memory device comprising a plurality of flash memory blocks among which are accessible blocks while some others are spare blocks for usage when there's an overwriting in an accessible block, thereby the substantial difference between a flash memory system and a conventional memory system will not prevent the flash memory system from being applied easily and conveniently, whereby the flash memory system can be used to replace conventional memory systems which are relatively limited by environmental conditions, control mechanism, storage density, as well as reliability.

Abstract: A memory access control method which includes the step of using a data processor to subdivide a data sector into a plurality of data fields when storing data, then using an encoder to add a respective error correcting code to every data field, and then storing error correcting code encoded in a memory, and the step of decoding the respective error correcting code when reading data from the memory, then storing the decoded error correcting code in a recorder, and then controlling an error correcting logic circuit to compare the decoded error correcting code, and then controlling the data processor to correct the respective data field if the decoded error correcting code is denied after comparison or controlling the data processor to read the data for output if the decoded error correcting code is confirmed.