Can't find where to open usbdevfs on Redhat 9
 

my usbdevfs shows mounted but I'm not sure how to access the usb drive. Can anyone help?

try /media or /mnt

Redhat 9??

If this is really RHL9 codename 'Shrike' (check the /etc/*release* file), then it's about 8 yrs out of date.
https://secure.wikimedia.org/wikiped.../Red_Hat_Linux
Do not use, try a more modern distro eg https://secure.wikimedia.org/wikiped...ting_system%29 or https://secure.wikimedia.org/wikipedia/en/wiki/Centos