Firstly, I'm not certain if the flash drive contains an image written over the entire device, or contains files of images. For files over 2 GB you don't want to use a fat32 filesystem.
It doesn't sound like you understand mount points. If the flash drive is mounted, and you want to copy files to or from it, you do so from the mount point. E.G. cp /media/flash/file /home/username/Desktop/.
If the flash drive had a image written over the flash device itself, and you want to use the partition/filesystems image to recreate that filesystem, you would use dd as root:
Here is an example using dd to copy the image from /dev/sdb to the main drive /dev/sda. This would replace everything on /dev/sda. You might do this from a live distro to create a bare metal backup:
dd if=/dev/sdb of=/dev/sda bs=1024
More likely, you would use dd to copy an image file:
dd if=/media/flash/imagefile of=/dev/sda bs=1024
For production servers, they may use Red Hat. Red Hat uses LVM volumes, so there would be a lot more for you to learn. I'd recommend installing Fedora Core, CentOS or Scientific Linux on your own system.
Last edited by jschiwal; 05-28-2011 at 06:34 PM.