Samsung Captivate :: Plugging To Computer

When I plug my phone into the computer and mount it, I get "F" and "G" drive showing up. When I click on "F" the folders that show up are "DCIM" "download" and "sounds" if I click on "DCIM" inside there I get "camera" and "music". I believe that's the SD card because when I open "DCIM" then into "Camera" I see all of the pictures and video that Ive taken.

One problem I had today was I tried to add a couple of pictures directly into the "camera" folder, from my computer, I see them in there, close everything down, unplug the phone, open up gallery and those pics just refuse to show up?? . .(I'm pretty sure its not a size issue they were relatively small files) Next is the "G" drive. I click on that and see "albumthumbs" "android" "bluetooth" "DCIM" "download" "music" "sd" (which shows up as a hidden folder) "sounds" and "where". When I click on the "DCIM" folder in this drive I get ".thumbnails" and "camera" Inside the "thumbnail" folder I see a mixture of some pictures I've taken and any pictures I've saved from text or email.

I have no idea if this is the way the phone should show up when I plug it in. the two trees of folders seem very confusing. when you plug your captivate in that has an SD card, how should it look when you hit "my computer" If you could give me a scenario of the "folder" tree, or trees. that would be cool.