Why are you writing this?
What do you expect?
Of course, it is quite normal for an operating system to be able to read the contents of the disks. When using backtrack as a LiveCD/DVD for example it is normal.
You asked about strategies.
I suggest that one does not allow physical access to the machine. Encryption is useful but all encrypted material needs to be decoded at some stage upon entering userland for normal processing.
So, what did you expect?