![]() This is the checksum of the CID contents computed as described in SD Specification. The manufacturing date is composed of two hexadecimal digits one is 8 bits representing the years(y) and the other is 4bits representing the month (m).ĬRC7 checksum (7 bits). The Serial Number is 32bits of binary number. The “n” is the most significant nibble and “m” is the least significant nibble As an example, the PRV binary value field for product revision “6.2” will be: 0110 0010b The product revision is composed of two Binary Coded Decimal (BCD) digits, four bits each, representing an The product name is a string, 5-character ASCII string. Ltd., SanDisk Corporation and Toshiba Corporation. Note: SD-3C, LLC licenses companies that wish to manufacture and/or sell SD Memory Cards, including but not limited to flash memory, ROM, OTP, RAM, and SDIO Combo Cards SD-3C, LLC is a limited liability company established by Matsushita Electric Industrial Co. This procedure is established to ensure uniqueness of the CID register. The OID number is controlled, defined, and allocated to a SD Memory Card manufacturer by the SD-3C, LLC. ![]() ![]() This procedure is established to ensure uniqueness of the CID register.Ī 2-character ASCII string that identifies the card OEM and/or the card contents (when used as a distribution media either on ROM or FLASH cards). The MID number is controlled, defined, and allocated to a SD Memory Card manufacturer by the SD-3C, LLC. The structure of the CID register is defined in the following paragraphs:īinary number of 8-bit that identifies the manufacturer of the card. I ordered some cards from China with already changed CID for TNS510 navigation. Unfortunately, on the 2016 card made in philipiny with a sticker that was made in Korea, the change of the CID number was not successful. Every individual Read/Write (RW) card shall have a unique identification number. The SD card icon must be visible on the bar as in the screenshot. It contains the card identification information used during the card identification phase. We include the CID data in our SD card reviews so you may compare it with your cards.The Card Identification (CID) register is 128 bits wide. 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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