Boot OS X Volume appears on TimeMachine after ML install

Hi everybody,
I just upgraded to Mac OS X Mountain Lion 10.8.2 from Lion 10.7.5 (MBP 15" mid 2010). So far, everything went really well.
Today I ejected my TimeMachine Volume (External WD Elements 1.5 TB, 3,5", FileVault 2 encrypted under Lion 10.7.4), when ML asked me, sorry for the translation from german: "TBias I is one of 2 partitions on this hard drive. Do you want to eject TBias I or both?"
Now the strange thing is, that this was for sure not there in Lion. I checked for all hidden partitions (defaults write com.apple.DiskUtility DUDebugMenuEnabled 1), and there are 4 listed with the details underneath:
1) The disc "TBias" Iitself, the only one visible normally (/Volumes/TBias I, encrypted, 1.5 capacity, capacity for whats occupied and free)
2) disk2s1 (not activated, EFI, 209.7 MB)
3) TBias I (not activated, pysical core storage volume, capacity 1.5 TB) --> is this normal? I have a second WD 1.5 TB where only disk1s1 appears?
4) Boot OS X (Volumes/Boot OS X, capacity 134,2 MB) --> even though it says its Mounted, it doesn't show on desktop or anywhere.
TimeMachine is working just fine, but I would like to get rid of this message that appears everytime I try to eject the volume. Unfortunately, I don't know if I can erase "Boot OS X" safely or not. I also didn't find anything about this newly appearing partition on an external TimeMachine Volume.
So my questions:
- Why did this appear?
- Can I safely erase this partition to get rid of this message?
- is the second TBias I, hidden partition normal? On my other WD 1.5 TB it does not appear
Thanks for your help, I appreciate it.
Best,
Tobias

I see this too. When I open Disk Utility (DU), I can see all the partitions even the hidden ones. I read the defaults for DU and I had turned on:
DUDebugMenuEnabled = 1
DUShowEveryPartition = 1
Turning those back off prevents ML from asking about ejecting all partitions.

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