Abstract: The present invention discloses a data access method accomplished by the following steps of: creating a predetermined password; generating a first encryption key; encrypting data based on the first encryption key; prompting for the predetermined password upon receipt of an access request; decoding a header of the NAND flash memory based on a user-entered password; examining the header to determine whether a mapping between the user-entered password and the first encryption key is defined; and decrypting and outputting the data by a decryption key when the mapping between the user-entered password and the first encryption key is defined.

Abstract: A flash memory system comprises a group of pages each consisting of a plurality of memory zones with various sizes; a read/write controller for controlling reading or writing of data from or to one of the pages; an error correction unit including at least two ECC (Error Correction Code) engines each encoding or decoding the data for performing error detection and correction; and an ECC judgment unit for selecting one of the ECC engines on the basis of predetermined conditions.

Abstract: The present invention discloses a portable data storage apparatus for use with a host device, including an interface coupled to the host device for data transmission therebetween, a real time clock (RTC) for synchronizing the portable data storage apparatus with a clock time, and a memory module for storing data and a detection program for detecting time discrepancy between system time of the host device and the clock time of the RTC after the storage apparatus is loaded to the host device.

Abstract: The present invention discloses a data access method accomplished by the following steps of: creating a predetermined password; generating a first encryption key; encrypting data based on the first encryption key; prompting for the predetermined password upon receipt of an access request; decoding a header of the NAND flash memory based on a user-entered password; examining the header to determine whether a mapping between the user-entered password and the first encryption key is defined; and decrypting and outputting the data by a decryption key when the mapping between the user-entered password and the first encryption key is defined.

Abstract: A flash memory system comprises a group of pages each consisting of a plurality of memory zones with various sizes; a read/write controller for controlling reading or writing of data from or to one of the pages; an error correction unit including at least two ECC (Error Correction Code) engines each encoding or decoding the data for performing error detection and correction; and an ECC judgment unit for selecting one of the ECC engines on the basis of predetermined conditions.

Abstract: A universal serial bus (USB) memory system and a control method thereof are disclosed. The USB memory system includes a microprocessor, a storage unit in communication with the microprocessor, an interface unit in communication with the microprocessor, an audio device in communication with the microprocessor, and a sound output device in communication with the audio device. Moreover, the control method includes steps of a) automatically executing a program of a host system while the USB memory system is connected with the host system via the interface unit; b) selecting one of a MIDI and a chord signal as an audio signal via the program; c) transmitting the audio signal to the audio device; d) decoding the audio signal by the audio device and transmitting a resultant decoded sound signal to the sound output device; and e) outputting the decoded sound signal via the sound output device.