![]() Manufacturing Date: This is a 12-bit code that specifies the manufacturing date of the SD card.Serial Number: This is a 32-bit code that specifies the unique serial number of the SD card.Product Revision: This is a 8-bit code that specifies the product revision of the SD card.Product Name: This is a 32-bit ASCII code that specifies the product name of the SD card.OEM/Application ID: This is an 16-bit code that identifies the OEM or the application for which the SD card was designed.Manufacturer ID: This is an 8-bit code that identifies the manufacturer of the SD card.The CID number is composed of the following values: Here is a snap shot of the CID reading tool for 20 SD devices: For a full description of the article, make the jump: How to read CID number from SD media. Some manufacturers require to read the CID number from SD media before the software is published and this is what talks about. Since the CID number cannot be changed or modified, it’s a great way to prevent unauthorized distribution or content or software. The CID number is most often used for vendors or manufacturers to lock in software to a specific device. This is a number which cannot be changed or manipulated by the host computer. The CID number is a unique identifier number or serial number created on the SD or microSD media at the time of manufacturing. Some also call this reading the CID number from an SD card. just posted a nice article on how to read the CID (or PSN) from an SD card, or product serial number. We include the CID data in our SD card reviews so you may compare it with your cards.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. The CID information can be helpful in identifying counterfeit memory cards. How can I use the information from the CID? CompanyĪgfaPhoto, Delkin, Integral, Lexar, Patriot, PNY, Polaroid, Sony, Verbatim For example, PNY cards have been found with 0x000028 and BE (Lexar) or 0x000027 and PH (Phison). Many card brands are produced by OEM suppliers, and the MID and OEMID may reflect this, or in some cases they appear to show the producer of the card controller. The following list was compiled by reading the CID on numerous SD cards. They consider this information confidential so an official list is not published. Manufacturer ID (MID) are assigned by the SD Assoication (SD-3C LLC). * these are the attribute titles used for the card in Linuxįor more information, refer to the SD Association Simplified Specifications. Manufacture date is stored in the form yym (offset from 2000)ħ bit code used for checking errors in the card register This 32 bit field is intended to be read as an unsigned integer The PRV can also be found by using the hwrev and fwrev, where x=hwrev and y=fwrev Identifies the card OEM and/or the card contents. ![]() ![]() The following information is stored in the CID: Name To view the CID, the command is cat /sys/block/mmcblk0/device/cid (the exact location may be different) What information is in the CID? Under this location you will see several attributes available that include the CID and CSD registers and the information inside it. Insert the card and look under /sys/block/mmcblk0/device/ (this location may change depending on your platform, it may be mmcblk1 or in a different location). With Linux, reading the internal SD card information is simple. Not all computers with built-in card slots will work, some internal card readers are connected through a USB bus.Īssuming you have the proper hardware, there are several methods you can use to get the card information. This will not work through a USB card reader because the command to retrieve the card information is intercepted and not understood by card readers. Card readers in laptops are usually connected directly through the PCI bus (or IDE bus). One way to read the CID is to use a laptop with an SD card slot. (According to SD card specification the information is only to be written once, however if a card does not conform to the specification this information could be changed!) How to read the CID from an SD card The CID register is set when the card is manufactured and cannot be changed after it is set. One of these is the Card Identification (CID) Register, a 16 byte code that contains information that uniquely identifies the SD card, including the card serial number (PSN), manufacturer ID number (MID) and manufacture date (MDT). ![]() ![]() Information about an SD card is encoded in its internal card registries. ![]()
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