Can't rename MXF-files on XDCAM anymore

Hi there,

after exporting projects to my XD-Cam drive (Output-Export To Devide-XDCAM...) I used to rename the files on the disc with the finder (OSX 10.8.5) in the Clips-Folder. After upgrading to MC 7, doing the same thing, now I have to enter my password and after that OSX tells me I have no access rights. Even though I have an admin account and right-click-I tells me that I have the right to read and write on the XDCAM disc.

Anyone solved that problem before? If I can't rename with using finder, is there a way to rename a clip on the XDCAM disc within Media Composer? (When I change the clipname in the bin after AMA mounting, MC doesnÄt change the name on the disc)

Thanks a lot,

Arnie