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. UPDATE (Feb 16, 2023): We learned the company which manufactures this product now offers the ability to write the CID value as well as write protect the Secure Digital media. 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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