I wanted to limit the usb drive use on my imac. but it turned out to be disastrous

i googled "how to disable external drives on mac" and got the best solution in this forum- http://forums.cnet.com/7723-6126_102-521447/disable-and-limit-the-extern-usb-dri ve-connect-to-mac/ . a user had written in code to be ran in terminal to get the result. i simply wanted to prohibit my mac from reading/mounting any device connected via usb as i didn't want to share my data with a specific person because of some personal reasons. i wrote this code in terminal and i got the result. this was the code-
cp /System/Library/Extensions/IOUSBMassStorageClass.kext ~/backup/
sudo srm -rf /System/Library/Extensions/IOUSBMassStorageClass.kext
sudo touch /System/Library/Extensions
sudo reboot
now my mac cannot read/mount any device connected by usb, even my printer is not functioning because of this. i'm very worried about this problem. can anybody please help me as i'm unable to copy data to my pendrives and external HDs. can anybody help me witht his problem ?. it isn't even reading my ipad/ipod when i'm inserting them and am unable to sync them . i'm very worried. please give me a solution !! i simply want to revert the effect of this code.
Note- even restarting my mac doesn't help

Modifying the system when you're not sure of the results isn't usually a good idea, but I guess I don't need to tell you that now. Restart your computer while holding Command-R and reinstall OS X. Password protect your user account and disable auto login.

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    Hello,
    in the links below you can found many informations to help you:
    https://msdn.microsoft.com/en-us/library/windows/desktop/aa365730(v=vs.85).aspx
    http://www.codeproject.com/Articles/696388/Recover-Data-From-Corrupted-Drives-File-Systems-FA
    http://www.functionx.com/vcsharp/fileprocessing/drives.htm
    http://forums.codeguru.com/showthread.php?548305-partitioning-USB-Falsh-drive
    http://forums.codeguru.com/showthread.php?548169-USB-Flash-drive-Partitioning

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