PS1/2 games not showing up in opl

[Vickfury1118]

hi im using opl 9.4 and im trying to copy over iso using usb extreme and i have used the program before and im trying to copy over games to it show they can show up on my harddrive but 2 games are not showing up they were on there before but now they are not showing up ive had these games on the harddrive before but i had to reformat my drive