Disable Usb

The USB storage drive automatically detects USB flash or hard drives. You can 
easily force and disable USB storage devices under any Linux distribution. The 
modprobe program used for automatic kernel module loading and can be configured 
to not load the USB storage driver upon demand. This will prevent the modprobe 
program from loading the usb-storage module, but will not prevent root (or 
another program) from using the insmod program to load the module manually.

Type the following command:
# echo 'install usb-storage : ' >> /etc/modprobe.conf

You can also remove USB Storage driver, enter:
# ls /lib/modules/$(uname -r)/kernel/drivers/usb/storage/usb-storage.ko
# mv /lib/modules/$(uname -r)/kernel/drivers/usb/storage/usb-storage.ko /root
BIOS option

You can also disable USB from system BIOS configuration option. Make sure BIOS 
is password protected.
Grub option

You can get rid of all USB devices by disabling kernel support for USB via 
GRUB. Open grub.conf or menu.lst (Under Debian / Ubuntu Linux) and append 
"nousb" to the kernel line as follows:

kernel /vmlinuz-2.6.18-128.1.1.el5 ro root=LABEL=/ console=tty0 
console=ttyS1,19200n8 nousb

Save and close the file. Once done just reboot the system:
# reboot

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