How to deactivate a USB external storage device in a Mac

1, first to the system preferences, add an administrator rights account.

2, then to the system hard disk/system (System)/library (resource pool)/expansion/path.

3, will expand the folder press Introduction (cmd + i) in the lower right corner after the unlock, press the Left + number to add their own account can read and write permissions.

4, then in the extension, find Iousbmassstorageclass.kext This file, and remove him to other locations, the system will ask your password.

5, after the System Preferences set the account number, unlock, the original user's "Allow users to manage the computer" check item cancellation.

6, after the reboot, the USB thumb disk, external hard disk, read card machine can not be used, but the mouse normal.

7, there is no need to use the FireWire device, you should be able to put the system hard disk/system (System)/library (resource pool)/expansion/location, iofirewire the beginning of several files moved out of the original location can be.

8, iousbfamily do not move to, otherwise all devices, such as the keyboard, touch board can hardly be used, the file mentioned earlier, in principle, as long as moved location, do not delete, or later to restore use, only to recharge a path. This will come in handy place, probably is the company majority.