I would get an mp3 player. You can hold a lot of books on the one device, and you can connect it to the car system, external speakers, or headphones easily. And, you don't have to deal with annoying skips.
I forgot all about MP3 players. That's a good idea.
Also the FAT32 vs NTFS format was probably the problem when I tried the flash drive. I'm fairly sure NTFS is the default format now on windows.
Thanks for all the advice, we are antiApple so those suggestions are not applicable, but thanks for the suggestions. I'll try a FAT32 flash drive and if that does not work a MP3 player.
I convert all our audio books to MP3. Last time I tried our public library they had a thin selection and most of what They had was checked out. But that was years ago.