No.
The iPad and iPhone does not present a USB disk interface to computers.
While I do not have a Windows system, I suspect that all you are seeing is the media library (pictures, music, videos, ...), not the entire iPad or iPhone storage. And I'm thinking this is via special software that makes the media library API's look like a mounted file system. The iPhone/iPad does not do that directly.
If I guessed wrong about what storage Windows is showing you, please correct my misunderstanding.
"iTunes", "iPhoto", and the "Image Capture" apps (plus 3rd party photo apps) can access the iPad and iPhone. "Preview" -> File -> Import, can get things from your iPhone/iPad photo library.
In doing some Google research, I found iExplorer for the Mac <http://www.macroplant.com/iexplorer/download-ie3-mac.php> that effectively does the same thing as iTunes, iPhoto, Image Capture, Preview more or less. I'm sure there are other utilities similar to iExplorer available.