Mass storage and debugging

[Szalooth]

Hi,
recently I got (or probably made) this problem: I can't connect my X10 Mini Pro as a mass storage without switching the Debugging mode on. I even re-installed the software but the issue persists. Can it be that it's because of my SD card? I divided it into 2 partitions - first for the installed apps (ext2), second for data (FAT32). When I connect the phone, only the data partition is recognized by the computer (Win7 64-bit) which I find understandable, though.
I don't care that I have to have the debugging running, but I don't know if it's safe for the phone/PC or if it drains the battery more.
Can someone help/explain?