Front Discs & Rear Disc

[wheelywill]

HI just wondering if theres anyone out there that could help with this query , having my wheels painted and needed to remove front discs which i did and noticed that they were showing all shiny side facing out but on the reverse there is a black part on the inner part but to confuse this matter the rear disc had the black facing out ,is there a right way or does it not matter cheers Dave