How to differntiate between folder and volume of a drive in mac Using QFileDialog.

[merry]

Hi

Working on Qt4.3 on mac OS, I m trying to select a folder using QFileDialog::getExistingDirectory
but using this , i can able to select a volume of a drive, it can take volume as a folder.
How can i differentiate between volume and a folder.

Regards
merry

[wysota]

Is there a difference between a volume and a folder on Mac? Doesn't it use a unix-like tree filesystem structure?