[Q] Cant mount "mount /sdcard in CWM

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http://forum.xda-developers.com – hi guys, i was coming back from CM10 to stock 4.1.1 on my nexus and when in CWM, i deleted all the content on sdcard by accident. now there is no zip file on the sd card to install the rom, I tried mounting sdcard and copy but it doesnt mount.when i press mount /sdcard, nothing happens>(doesnt show the partition on computer and doesnt go ot :unmount /sdcard.) Im stuck in here and dont know what to do. please help! (HowTos)