109(BK): No software, no fancy faceplate, no Pioneer logo, no QuietDrive support. BK is the black versions. Runs with regular 109 FW.
109XL(A,B,S): No SW, fancy faceplate but without Pioneer logo. QuietDrive support so runs with XL FW. "A" is beige, "B" is black, "S" is silver.
A09XL(A,B,S): SW bundle and Pioneer logo in addition to the 109XL drives.
A09 plain: I've never seen such drive, but theoretically it's possible. :bigsmile: