The CID number is a compilation of information about the card, such as manufacturer, date manufactured, checksum total, GB size and more. It is programmed during card manufacturing and cannot be changed by SD Card hosts. The CID register is 16 bytes long and contains a unique card identification number. It requires specific access codes to the index table of the memory card, and unless you know how to use the SD chipset of your card reader, chances are you wont get the number…or least the correct and accurate number. Reading the CID number from an SD card is not an easy task. The CID number is valuable because software developers and hardware developers can lock software to the unique number of the device thus eliminating the ability to pass along licensed software. The CID number is a unique card identifier number that is unique to the card itself. Most phones and much of the software on phones will lock in to the CID number of a SD card. Some also call this “reading the PSN off the SD card” or reading the product serial number off the SD card. If you are looking to read the CID number of an SD card, or extract the CID off an SD card then you’ve find this article very helpful.
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