yesterday, a stranger thought it perfectly cool to plug his iphone into my work macbook when i wasn't looking. in all honesty, i think he is just a clueless twit who wanted a charge, but i was horrified all the same. i've run a full system scan with ClamXAV, plus used some other tools from Objective-See. what i would like is to configure my machine so that anything plugged in does not automount, and i would then get a chance to proceed w/ mounting or reject it. i tried Disk Arbitrator on my home laptop as a test, but it doesn't work correctly: 1. even when enabled and set to Block Mounts, it happily mounted my iphone (indeed, it was the *iphone* that asked to trust the *computer*) 2. though an inserted USB stick did get blocked, it did not mount properly when i used DA to tell it to mount am i using DA incorrectly? am i incorrectly assuming that a tool that blocks automount of drives shouldn't necessarily do the same for a phone? is there another solution? keep in mind this is for strange devices, so i would not know any IDs ahead of time such that i could use the FS table, per this solution. my work laptop is on High Sierra (10.13.13). my home laptop is on El Cap.