finder doesn't display all the files from my external hard drive

[lophi7]

Finder doesn't display external hard drive files that begin with letters following "M". Files that begin with a number are there, as are the files that begin with letters from A to M. Anything after M doesn't display. I know the other files are there because when I search for them I can retrieve them. My external hard drive is a Seagate Go Flex Desk Adapter USB 3.0 (2 tb).