How to block USB mass storage ??

I use 'USB Block' from the Apple App Store.

It blocks USB, plus networking and bluetooth (you can toggle these on and off)

I've used it for over a year and it seems OK, doesn't consume a huge amount of CPU time and hasn't caused any instability I can see. I run it on a team of about 5 Macs.

It resides on each Mac and runs in the background (menubar item) with a password to block people from accessing it.

You can whitelist USB devices as well.

Here's one article. I'm sure there are many more to be found by doing a search.

https://www.makeuseof.com/tag/disable-usb-storage-devices/

Yes. In my own experience, it depends on the manager, and what they have already done to their budget, or what they fear they will do — depending on the individual. I have run into customers that have blown their entire annual IT budget and had to take out a short-term, n-tuple million loan to afford new hardware and SAP integration expenses.

$10 * 500+ Macs is at least $5000 out of someone's budget. 🤓

I only purchased it once - I simply logged in and downloaded onto each Mac.

$10 * 500+ Macs is at least $5000 out of someone's budget. 🤓

I'm thinking $5000 is insignificant if you purchased 500+ Macs.

I only purchased it once - I simply logged in and downloaded onto each Mac.

I'm sure the developer appreciated that.