I don’t know Mac OS. But on Windows, when you switch the SC6000/m into computer mode and connect it to a computer with the blue USB cable, all the connected drives, USB, SD, S-SATA will appear in This PC / My Computer. From there you can use your PC to copy files and folders to the drive. However, a word of warning, if you are using Engine Desktop to prepare drives, never manually, add, remove, or edit files / folders on an exported drive. You will corrupt the database. In this case, all changes must be made through Engine Desktop and then exported to the drive.