where r the downloaded files kept by apt-get update

i want to store the list and software downloaded on a cd

also please tell me how can i pause the apt=get update

it takes 5 hrs to 11 hrs to get the files if i can spare that much time power failure also comes in now and then

can anybody help

how can i mount the hda2 read and write mode while booting

thanks
ramaswamyps