How to Blacklist USB Storage

Method 1: Blacklist Module

sudo nano /etc/modprobe.d/blacklist-usb.conf

Add:

blacklist usb_storage
blacklist uas

Method 2: Disable via Kernel Command Line

sudo nano /etc/default/grub

Add to GRUB_CMDLINE_LINUX:

modprobe.blacklist=usb_storage

Then update grub:

sudo update-grub

Method 3: udev Rule to Block

sudo nano /etc/udev/rules.d/50-usb-block.rules

Add:

ACTION=="add", SUBSYSTEM=="block", ENV{ID_BUS}=="usb", RUN+="/bin/rm -f /dev/%k"

Reboot to Apply

sudo reboot