OK I have tried to transfer files 2 ways:
1) USB method - the USB formatted to FAT32, Retropie creates the directories, I put the files in the proper rom directory and insert back to the Retropie for automatic transfer.
2) use Explorer to go to \\retropie and drag & drop over network
In both cases I get errors. The windows error that comes up states I don't have enough room. There's 26GB free on the RetroPie card, the file sizes are anywhere from 4MB to 32MB and yet when moving 886 files totaling 6.62GB there's an error. I successfully got 435 of them to transfer then:
6.22GB is needed to copy this item. Delete or move files so you have enough space.
As of this posting I am going to try and move 150 files at a time and see if that helps but I'm assuming it's something I am missing.
Also - the 522 Atari 2600 games transferred with no issues all at once.
Edited by ClassicGMR, Mon Feb 12, 2018 8:27 PM.