Sd Card Cid

 
Sd card cid formatSd Card Cid

Problem read CID Card SD. Samples - non photo!

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Building on Dinesh's answer. Dinesh suggested looking in the directory /sys/class/mmc_host/mmc1/mmc1:*/ (where * is a number) for the file named cid, which gives us the contents of the card's CID register. This is does work in many cases, and is a very helpful start. But mmc1 is not always the removable SD card. Sometimes, e.g.

Sd Card Cid Register

On a Motorola Droid Pro with Android API level 10, mmc0 is the removable SD card, and mmc1 is something else. I'm guessing that mmc1, when present, points to internal storage of some sort (possibly a non-removable microSD card). On a cheap Android tablet we tested, mmc0 is the SD card and there is no mmc1. So you can't just assume that mmc1 is the SD card. A glimmer of hope: It seems (so far) that by looking at the type file in the same directory as the cid file (e.g. /sys/class/mmc_host/mmc1/mmc1:0007/type), we can determine which is which: a type value of SD indicates a removable SD card, while MMC is not. However, that's just from testing on a few Android devices.

The SD card ID is not printed on the card itself, so you have to put the card into your computer to figure out the SD card ID number. Once you can open the SD card on your computer you are able to extract the SD card ID from the card. Alibaba.com offers 2,303 cid sd card products. About 100% of these are memory card, 1% are access control card. A wide variety of cid sd card options are available to you, such as sd card, tf / micro sd card, and mmc card. Finding attributes of mounted SD card. Ask Question 10. My SD card is automounted fine as /dev/sdb. In my case, with this answer, I could find most SD and MMC device attributes. Cid, csd, scr, date, fwrev, hwrev, manfid, name, oemid, serial. – agfe2 Aug 28 '18 at 8:28. This SD Duplicator has the ability to read the CID number from an SD card and export it into a.csv file. From the.csv you are able to use that information anyway you see fit for your application. The PC based system offers unique data streaming to each card.

I can't find any specifications about the contents of the type file, so if somebody else knows of relevant documentation, please let me know. Of course, MMC and SD are just two different storage technology standards, and SD is backward-compatible with MMC. So it's not necessarily the case that type SD always corresponds to an external microSD card.

It doesn't seem likely that MMC could indicate a microSD card at all (if the type field is populated accurately); but on the other hand, it's conceivable that a non-removable SD card could have type SD. For further research: Does this approach work when an microSD card is connected via a USB adapter? My one test on this, with a tablet, had the USB-connected microSD card show up as mmc1, with type SD.