![]() Please note, while the code below works using the Javascript of your browser, I have no prior Javascript coding until today, with much help from Google searches and W3schools. I used this reference by Sandisk for the data field lengths and types. Unfortunately, I haven’t seen a large CID database online, nor have I seen a CID decoder that will decode the hex string into the component parts (some BCD, some ASCII, others Unsigned Int or best as Hex), so I went on a journey to code one up for CID. By comparing some cards that you own with the known signatures, you can have some reassurance whether your cards are similar, or genuine. By running Chrubuntu, getting the CID or CSD data from a card is as simple as: cat /sys/block/mmcblk1/device/cidĮt voila! You will be rewarded with a hexadecimal string with the data in it. ![]() Under the Chromebook, the SD reader slot on the side is directly connected to the SD bus of the ARM CPU and is not a USB based reader. ![]() I am aware that it was possible to do this via the SD Card Shield and Arduino, but since I have a Chromebook, things got really easy. These can only be accessed directly via hardware and not via most card readers. There is also another called the CSD or Card Specific Data Register. One is known as the CID, short for Card Identification Register. SD cards, along with their “counterparts” mini and microSD cards, all contain manufacturer defined information in a set of registers. This is the checksum of the CID contents computed as described in SD Specification.Buying flash memory from poorly reputed places, such as Chinese computer markets, and online auction sites is an often known way to collect BAD flash memory cards that fall short on performance, longevity and data security. 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. Every individual Read/Write (RW) card shall have a unique identification number. It contains the card identification information used during the card identification phase. The karte Identification (CID) register is 128 bits wide.
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