If you are looking to read the CID number of an SD Card or to extract the CID number off an SD Card, you can only do this with specific hardware. You cannot read the CID through a computer's SD Card socket.
All GPS devices and most phones will lock software to the CID number of a SD or MicroSD card. The CID number is a unique string of digits that are unique to that one card, itself. CID number is valuable since software and hardware developers lock their software to the unique number of the device eliminating ability to pass along licensed software.
Whatever blkid returns will change whenever the data stored on the SD-card changes. This is much different to the CID or serial number. If you made a dd if=/dev/sdcard1 of=/dev/sdcard2 count=2, changes are very hight that blkid /dev/sdcard1 will be identical to blkid /dev/sdcard2.
- Remove the password on your card with LockUnlock(CLEARPASSWORD,passwordptr,passwordlength); In your system call InitAndMountSDCardFileSystem which calls mediaInit, my password / serial number code, and then fileMount Make the behaviour on finding the wrong card, or a card without a password set, as you wish.
- Quest: Hack an SD Card Find and hack an SD card – Control the micro to make an LED flash, at a bare minimum – Challenge: no public docs available on controllers Our story – Hardware tools developed to inspect, learn, and hack SD cards – Software tools and static code analysis to discover back doors and controller structure.
How to read CID number from a SD Card?
It is not an easy task and requires specific hardware and sometimes also requires specific vendor commands.
What is the CID number of an SD Card?
Sd Card Cid
It is 16 bytes long and contains a unique card identification number. The CID number is a compilation of information about the card manufacturer, date manufactured, checksum and total size.