Product Name PNM name 5 characters long (ASCII) Product Revision PRV hwrev, fwrev Two binary coded decimal (BCD) digits.
OEM/Application ID OID oemid Identifies the card OEM and/or the card contents. 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? The following information is stored in the CID: Name Field Linux attribute* Description Manufacturer ID MID manfid Assigned by SD-3C, LLC. Under this location you will see several 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). (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 One way to read the CID is to use a laptop with an SD card slot. 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). Internal SD Card Information Information about an SD card is encoded in its internal card registries. Assuming the Pi is sealed inside your product, the user won't have access to get around it, plus they won't have any way of knowing which serial. Could you not just use the serial number of the Pi? They are random(ish) and (almost) unique. This free Microsoft program allows you to edit the. If you have reason to change the serial number on your memory card, you will need the VolumeID utility. All electronic storage devices, including memory cards, have such a number. A serial number is an identifying code assigned to a piece of hardware.
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