Abstract: The present invention is adapted to data storage technology field, and provides a reading/writing control method and system for nonvolatile memory, the method including the following steps: dividing valid blocks in the nonvolatile memory into different zones, the zones including at least one data zone having fixed number of valid blocks and one exchange zone having at least two valid blocks; creating a mapping table of logic blocks and physical blocks in each zone; establishing a mapping table of logic pages and physical pages in the blocks based on redundant area information of pages in the blocks, and storing the mapping table of the logic blocks and physical blocks in each zone and the mapping table of logic pages and physical pages in each block in a private data area; and writing data segments in an idle page of the blocks of the data zones in sequence, or reading data segments from valid pages in the data zones, thus the data reading/writing speed and efficiency is promoted.

Abstract: The present disclosure relates to the field of players, and provides a portable multimedia player includes a housing; an integrated circuit module received in the housing for playing multimedia; a storage device interface electrically connected to the integrated circuit module, and configured to connect to an external storage device; and a male HDMI connector electrically connected to the integrated circuit module, configured to be connected to a female HDMI of an external display device. The multimedia function of the external display device is expanded by connecting the male HDMI 11 to the female HDMI of the external display device. The portable multimedia player is connected to the display device without any corresponding interface cable, such that it affords convenient using to users and beautiful appearance.

Abstract: An adjustable USB female connector includes a metal top shell, an insulated main body with connection pins which are compatible with USB interface protocol, and a metal bottom shell. The connection pins are fixed on the insulated main body. The insulated main body is fastened in the metal top shell. The metal top shell is slidably connected to the metal bottom shell, and the total thickness of the metal top shell and the metal bottom shell is variant. In a first orientation, the thickness of the USB female connector is the smallest, and the thickness is smaller than that of the standard USB female connector. In a second orientation, the metal bottom shell is pulled out, the thickness of the USB female connector increases and reaches the thickness of the standard USB female connector.

Abstract: A method of encrypting/decrypting the document and a safety management storage device and system method of its safety management, using for the safety management of electronic documents, the said system comprising a PC or mainframe installed with common reading software and a storage device of safety management connected to the said PC/mainframe through hot-plug; when connected to the mainframe, the said storage device is enumerated as a USB CDROM device at least. The user owns the said storage device can encrypt the electronic documents by using the encryption keys to generate an encrypted document with the same file type, also can open the encrypted document by using common reading software, and then use the document according to the predetermined operation authority.

Abstract: A method of encrypting/decrypting the document and a safety management storage device and system method of its safety management, using for the safety management of electronic documents, the said system comprising a PC or mainframe installed with common reading software and a storage device of safety management connected to the said PC/mainframe through hot-plug; when connected to the mainframe, the said storage device is enumerated as a USB CDROM device at least. The user owns the said storage device can encrypt the electronic documents by using the encryption keys to generate an encrypted document with the same file type, also can open the encrypted document by using common reading software, and then use the document according to the predetermined operation authority.