How to block USB access in MAC????

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For OS X the guide describes disabling USB and Firewire storage:

1. Log on with an administrator account.
2. Browse to ‘/System/Library/Extensions’ folder on the system disk.
3. Trash both IOUSBMassStorageClass.kext and IOFireWireSerialBusProtocolTransport.kext which are found in this directory.
4. Empty the trash.
5. Reboot the machine.

Disabling USB storage on a Windows platform is only a little more complicated: