From: Timothy Goddard <interfecus@...>
Date: 2006-01-25T00:55:36+09:00
Subject: Re: Disk Free Space

This is highly OS-specific so I sincerely doubt there is a general
method. Different OSes treat disks entirely differently. To demonstrate
the complexity, simply ask yourself these questions: Is a network share
a disk? A folder on a remote FTP server? A loop device mounting a file
on a remote SMB server accessed via a VPN? The file itself?

Try either using a system-specific call for each platform you may be
operating on or simply try to write your stuff to the disk, catching
the appropriate error if it fails.