573results about How to "Reduce repair rate" patented technology

The invention discloses a NAND FLASH testing method. The NAND FLASH testing method includes the steps of S1, building an original bad block table; S2, writing in a configuration table and a self-check program; S3, running the self-check program, using ECC to obtain the digits of data errors in each sector, judging that the block which the corresponding sector belongs to is a bad block if the corresponding digits reach a threshold, and building a new bad block table; S4, comparing the new bad block table and the original bad block table, and judging that NAND FLASH is unqualified if the new bad block table and the original bad block table are different. The testing method has the advantages that the new bad block table is obtained by using the EEC, whether the NAND FLASH is qualified or not is judged by comparing the new bad block table with the original bad block table, testing accuracy can be further increased, data can be prevented from being stored in unstable storage space, and digital equipment is allowed to be stable in use and long in service life.

The invention discloses a blade spraying protective fixture which is used for being connected to spraying equipment so as to protect the lower surface of a blade edge plate and a tenon. The blade spraying protective fixture comprises a fixture body, a first stopping block, a second stopping block and locking pieces, wherein the fixture body is used for being connected with the spraying equipment and provided with a containing groove used for containing the tenon; the containing groove penetrates through the two side walls of the fixture body and communicates with the upper end surface of the fixture body; outwards convex positioning flanges extending in the length direction of the containing groove are symmetrically arranged on the two side walls of the containing groove so as to be used for supporting and positioning the long edges of the blade edge plate and enabling the upper surface of the blade edge plate to be exposed out of the upper end surface of the fixture body; the first stopping block and the second stopping block are arranged at the two ends in the length direction of the containing groove correspondingly so as to be used for blocking the two ends of the containing groove and being matched with the positioning flanges to support and position the short edges of the blade edge plate; the first stopping block and the second stopping block are both partially embedded in the containing groove and abut against the tenon located in the containing groove so as to clamp and fix the tenon; and the locking pieces are used for locking the first stopping block and the second stopping block with the fixture body.