Each tablet is different. ASUS has them in the directory /Removable/ and it will show MicroSD, SD or USBDisk1 depending on what is there. Acer has them in the /mnt/ directory. What type of tablet do you have?
I have problems reading the content in file managers but if Ihave a film, ebook etc. on the USB flash disk it shows up when I start the relevant application.
