How to read the SD Card ID number?

Question

How can I programatically read the SD Card\'s CID register, which contains a Serial Number and other information? Can I do it through Android Java, or Native code?

Answer 1

I managed to find my SD card CID by plugging my phone to my computer via usb and using the adb tool (Android SDK)

$ adb shell
# cat /sys/block/mmcblk0/../../cid

My phone is rooted so I'm not sure if this is accessible on non-rooted phones.

Also try

$ adb shell
# cd /sys/block/mmcblk0/../../
# ls
block                 fwrev                 preferred_erase_size
cid                   hwrev                 scr
csd                   manfid                serial
date                  name                  subsystem
driver                oemid                 type
erase_size            power                 uevent

These are explained in the kernel documentation http://www.mjmwired.net/kernel/Documentation/mmc/mmc-dev-attrs.txt