Can we format EMMC ?

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http://forum.xda-developers.com – Hi guys, i'm on Cyanogenmod 4.2.2 on my N7000, and I ask me a question, Can I format EMMC on the recovery ? Because my Galaxy Note reboot, has a lot of bug etc. So, i have format Data, preload, cache system etc, but not EMMC. Can I format it without brick my Note ? (HowTos)