Question bout .ext2

[YnYng]

Jus a quick question, i have formatted my 2 gb card, with one partition having about 650 mb for an ext2. can i just install the froyo cab and will the contents "move" to the ext2 partition? B/c i can't see the .ext2 partition in windows when i plug the card into my computer, so how would i use the froyo.rar? ( if i wanted) . Otherwise.. whats the point of having an ext2 partion if it takes up space on the 1.2 gbs that i still have left for media ( b/c i would be unrar-ing it to the fat partition, since i cant see the .ext2 on windows)?

just some questions i havent been really able to find answers on. thanks in advance guys

EDIT: so i was able to partition it via this way...
http://www.youtube.com/watch?v=xFx2r_n96k0, off of http://forum.xda-developers.com/showthread.php?t=619290.. but everytime i try to plug the card into my phone it says " do you want to format this card to make it readable" and i evn tried clicking yes, but nothing happens?\