Very careful, if you want to leave other OS on the hard disc.
Easiest would be dual boot to another (2nd) hard disc like drive 1, leave drive 0 ( original OS).
If you never done this before look fro computer geek, familiar with windows/linux, who has done this before.
Could be troublesome with windows.
If just Linux on the Dell MINI-9. create another primary partition and clone USB disk to new partition: