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 willĪvailable that include the CID and CSD registers and the information inside it. (this location may change depending on your platform, it may be mmcblk1 or in a different location). Insert the card and look under /sys/block/mmcblk0/device/ 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.
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(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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