Case sensitivity and VirtualBox shared folder

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Weird but true behaviour:

I have the case sensitive encrypted disk (sparse bundle with HFSX type) mounted in VBox shared folders. All works fine, after VM starts:

touch zz zZ

creates two files, both “inside VM” ~/development/ATG/platform-edc as well as in OS-X.

If the VM is suspended and resumed, it looses the case sensitivity inside the VM.

The command

cd ~/development/ATG/platform-edc
touch zz zZ

will create just single file. Outside the VM, in OS-X file system is still case sensitive.

It looks as if the wake-up remounted the volumen and normal HFS+ instead of HFSX