6/3/2023 0 Comments Sd card cid rewrite![]() OID – 2-character ASCII string that identifies the card OEM and/or the card contents.MID – 8 bit number which identifies manufacturer.However, if a card does not conform to the specification or a backdoor is found this information could be changed and CID usage for security purposes could be compromised this way! CID register fields It can be used as a random number for contents encryption, SD locking password generation, or license files. As a CID number is unique for each SD card, it is very often used for software licensing and content protection. CID number is set by the manufacturer and cannot be changed after it is set. The Card IDentification (CID) register is 16 bytes (128 bits) code that contains information that uniquely identifies the SD card. ![]() Today we will find out what is the SD card CID register and what information it contains. ![]() The OCR, CID, CSD and SCR registers carry the card/content specific information, while the RCA and DSR registers are configuration registers storing actual configuration parameters. Each card has a set of information registers : OCR, CID, CSD, RCA, DSR and SCR. SD card specific information is stored in internal registers. SD card is a device containing microcontroller and memory chip attached.
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