Placement of CD, CDRW, Zip & HDD on IDE

hi,
I am building a system with the following components. HDD, CD,CDRW and Zip. My questions is this. I intend to place them as follows HDD 1 master, Cd 1 slave, CDRW 2 master, Zip 2 slave. I want your thoughts on this placement for optimal usage.Thanks
Mark