I used to use Zip disks to sneakernet files to and from computers on an isolated network. This was when USB flash drives were ~8-16MB and we were not guaranteed

I used to use Zip disks to sneakernet files to and from computers on an isolated network. This was when USB flash drives were ~8-16MB and we were not guaranteed access to part of the machine were a USB slot was. I also remember using Sysinternals Sync before ejecting the disks. Too many times did I get back to my desk and have corrupt (incompletely written) files otherwise.