Detect run from drive type

[Russell Martin]

Does anyone know of a way to detect whether an app is being run from a
removable drive? The goal being, if the app was run from a
removable/writable drive (i.e. a usb keychain drive, but not
necessarily a U3 volume), the app would then read & write its prefs in
the folder it was run from, but if run from a fixed drive then it would
read/write its prefs to the user's home directory.


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