I have OSX next to MorphOS

(Just installed the OSX) when startup I get a complaint

DISK REPAIR
The disk "Boot" was not repairable by this computer
It is being made available to you with limited functionality. You must back up your data and reformat the disk as soon as possible.

WHAT THE HECK! Dont touch my MorhpOS boot disk that I created with blood sweat and tears :)

Any idea why this message is shown and if it is possible to turn it off in OSX.