can't mount internal sd card

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http://forum.xda-developers.com – I try to do format the internal sd card but cmw recovery give me this error Error Mounting /sdcard/.android_Secure i can/t solve this problem i try also to restor a nandroid backup but it/s impossibile mount the internal sd card so the process is aborted. any solution? in this moment i try to flash with odin a stock fw, install the latest cwm and then retray to format :\ thanks (HowTos)