There are free antimalware apps, such as Bitdefender or Avast, that can scan a USB drive for viruses on Mac.
He was afraid that he could catch malware on his MacBook by simply inserting a disk. Naturally a very cautious person, my friend first called me and asked whether it’s safe just to plug the flash drive in or is there a better and secure way.
His coworker gave him a USB flash drive with a program that needs to be installed on his laptop. My friend, who knows that I run a blog about Macs and especially the security aspect of Apple computers, called me yesterday and told me about the situation in which most Mac users would be one day.