[Help Pls] Cannot mount internal storage

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http://forum.xda-developers.com – After i flashed latest version, i.e. special 0.7.1, CM9 by jokersax for my atrix, it was successful but there is something weird happened afterwards.. i found that i cannot mount my 10gb internal storage and i have tried to format /emmc in CWM, but it shows that error formatting /emmc i have tried to connect the phone to the pc in CWM and my external SD card can be read normally while a window pop out telling me to format the internal storage.. every time, i clicked "Mount SD card" under the internal storage in Settings>Storage, the status bar will show "Preparing SD (HowTos)