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[Raspberry Pi/ RASP] Formatting an SD card but stuck?

Thanks for Google again.
http://kevintechnology.com/post/29649230627/formatting-an-sd-card-for-the-beagleboardxmbone

Briefly talking about the situation:
There is a script in Raspberry official support webstie named mkcard.txt, which can be downloaded here: http://elinux.org/RPi_Advanced_Setup
However, even you use a brand-new SD card to prepare the Angstrom and Boot distribution of Linux, you may receive the following error:
/dev/sdd2 is apparently in use by the system; will not make a filesystem

*sdd2 is the partition I have in my sdcard.

There are two problems to be solved:
  1. We first need to remove the stolen devices from dmsetup:
    sudo dmsetup remove sdd1,  sudo dmsetup remove sdd2, etc.
  2. Comment out the line 36-38 in mkcard.txt to disable kpartx
Then you can run mkcard.txt again, everything is fine now.

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