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How To: Read CID on SD card

How To Read CID on 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.  Some also call this “reading the PSN off the SD card” or reading the product serial number off the SD card.

Most phones and much of the software on phones will lock in to the CID number of a SD card.  The CID number is a unique card identifier number that is unique to the card itself.  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.

Reading the CID number from an SD card is not an easy task.  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.

What is the CID number of an SD card?

The CID register is 16 bytes long and contains a unique card identification number. It is programmed during card manufacturing and cannot be changed by SD Card hosts.  The CID number is a compilation of information about the card, such as manufacturer, date manufactured, checksum total, GB size and more.  Below is a table outlining all the items which make up the SD CID number.

So with all this said, how do you read the CID number from an SD card?  As we’ve mentioned it isn’t easy and it’s [more or less] hardware based.  If you do enough searching on the internet you’ll find some home-brew code to read the CID numbers, but that’s only if you have the SD card or microSD card connected via an IDE bus to your host computer.  This isn’t easy for everyone.  There is clear evidence that using a USB to SD card reader will not get you the information you require, or at least accurate and correct information.  Meaning most times the CID number generated is actually the serial number of the card reader itself, not the CID number of a specific SD card.

In addition, what if you are required to read the CID number off SD media in bulk?  A single, one-at-a-time solution is not practical.

In my search to read the CID number from SD media, I cam across Nexcopy – a manufacturer of USB duplicator equipment and other flash memory equipment.  Several models they carry are SD duplicators and microSD duplicators.  With the secure digital duplicators part of their feature set includes reading CID numbers from SD media.  The equipment can ready 20 cards at a time, 40 cards at a time, or 60 cards at a time, depending on the model.  The duplicators will read the CID number and exported to a .csv file for import into other business functions.  This configuration makes it quick and easy to obtain the CID number.  Granted, the equipment is not designed for single use operation, but rather reading the CID of SD media in bulk quantity.  Here is a screenshot of Nexcopy’s software reading 20 CID numbers:

I didn’t contact Nexcopy Incorporated for pricing of the equipment, but doing a quick search for the equipment shows me a price of about $1k for the smallest 20 target system and $3k for the largest, 60 target system.

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How To: Make a USB Bracelet

Here is a simple way to make a stylish USB bracelet.  The project is very simple and requires no technical skills, but will take some time.  The largest amount of time you will spend is making the bracelet, so be sure to have your home-making skills fired up and ready to go.

Items you will need:

The first step is cutting up the cardboard to make the back-bone of the bracelet. Using tape to secure the lead start of the yarn, start wrapping Continue Reading

DIY: USB Slingshot for Angry Birds

Angry Birds is a great game for the first couple weeks.  New levels, new designs, new challenges.  However, the game gets a little stail for the 30+.  Today, we came across something which might re-kindle the fire for the 30-somethings who got burned out after a couple weeks. How about taking the slingshot in the game and making it real life?  This is exactly what this DIY hacker did. Over at MBed, the DIY tutorial for a USB slingshot gives step by step instructions, source code, design schematics and more for you to successfully remake a USB slingshot. Source:  MBed. Continue Reading

Intro DIY Project For Easy USB Charger

Looking to for a simple DIY project for a school report or class event, this USB charger is it!  Or if you’re just looking to try your hand with some simple electronic wiring to see if you have what it takes. Well, using some off-the-shelf times, a battery and the simple schematics below you can have a great USB charge for just about any USB product. The full tutorial is at Instructables, and I’ve also seen a couple good comments in their thread, like: Continue Reading

DIY: Keychain Made of Dice and USB Drive

These days it’s popular to take just about any house hold item, a USB flash drive, and mill out a space to make a USB mod case.  Today’s post is no exception.  Using just two dice and a mini USB, in four easy steps you can make a USB dice key-chain. Step 1:  Get your items.  Dice, USB, Dremel, blue or epoxy and a file. Step 2:  After some measurements, mill out the hold where the USB will be inserted. Step 3:  Repeat step 2 for the second die as this will be your cap.  You also need to drill a hole on a dice side for the lanyard which will attached to your key-chain Step 4:  Epoxy the USB drive into the base die, and attached the lanyard to the cap die.  Now you’ve got a USB dice key-chain. You might want to take things a step further and Continue Reading

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