You can delete filed from WD Passport by simply maing sure your external hard drive is coonected, go to start menu and double click computer. Rigth click on Passport drive and click on format. Format My Passport will pop up and below that place a check next to the quick format option. Click Start on the bottom and another screen will pop up sayin, "WARNING, Formatting will erase all data on this disk. Hit OK and your done. nice and simple. You can now verify by right clicking on Passport drive again and going to properties. It will show you that all the space on the drive is free. Hope this helps!!!