If you're one of these people, then you understand how utterly annoying it is to plug in a drive with about five or six partitions on it, and have five or six different Virus Scan-On-Mount windows pop up all at the same time. It eats the CPU, slows down the machine, and makes your FireWire drive go nuts.
For the longest time, I couldn't figure out how to make it stop, short of individually hitting Cancel on each window. Then I found a much faster way:
- Open Terminal (and you must be in an admin account to do this in 10.4.x.)
- Type sudo killall SmallScanner, press Enter, and provide your password.
- Do whatever you need to do.
[robg adds: I can't confirm, as the author didn't leave contact info, but I imagine that killing this process prevents scanning from occurring, in addition to simply killing the windows.]

