USB devices with internal memory

Greetings to the list -

Lately, I've been working with a few devices that contain internal 
flash memory for storage. The existing drivers for these devices do 
not mount them as a drive - in some cases, they seem to use slightly 
modified USB drivers specifically to keep you from accessing them as such.

For example: digital voice recorders; cameras that contain internal 
flash memory.

With items like flash memory cards/sticks/drives, as they present 
themselves as a drive to the Windows OS, they are easily imaged by, 
say, FTK imager - and it is similarly easy to recover deleted items 
(or, at the very least, view the contents of the memory space). The 
devices I've mentioned, while having internal memory that allows one 
to write files to it, and having USB interfaces, require proprietary 
drivers and software to access them.

Ideally, I'd love a Windows based solution, but any solution would be 
welcomed. How do folks handle such devices? Just image what you can 
(via the propriety software), or have you used other methods?

--
Michael Edwards