Epson P2000

Whilst the Epson P2000 does the job and presents very high quality images, the inherent filing system seems to me very cumbersome. I imagined that when connected to a host computer it would behave like an external hard drive, but for example, I downloaded some sound files for a long flight, but the p2000 couldn't find them. I bought mine secondhand and did not have the benefit of a manual. I found the menu system not very intuitive. Why are there sample folders on the home page which you cannot access or delete? ( I have now downloaded a manual from the epson site)Having downloaded files using the delete originals when finished, the pictures disappeared, but it did not release the space on the memory card, so when you put it back in the camera thinks it is still full!It was a very useful item, but having bought a new Canon 450D I cannot use it any more.