I don’t have, or know Win 8 so I’m shootin’ from the hip here, but it sounds like it’s a hidden file situation. You might see if there’s a setting in Win 8 to “show hidden files and folders” like there is in previous OS’s, although I can’t imagine why the files you put on the drive would be ‘hidden’ by Win 8 in the 1st place.
When you copied your files to the USB drive did you use SecureAccess or did you bypass it? If you used SecureAccess when you plug the drive into the laptop does SecureAccess run? Is Windows 8’s security system preventing it from running? Does SecureAccess need to be run in Compatibility mode in Windows 8?
It is not required to run SecureAccess to copy files to or from the USB drive. Normal files can be written to the drive along side the SecureAccess folder.