FInding the hard disk storage capacity programmatically

Question

How do I find out the storage capacity of my harddisk without using the OS functions like dir or ls?

Answer 1

On windows:

Win32: GetDiskFreeSpaceEx

.NET: DriveInfo

If, for whatever reason, you still don't want to use those, you can send an IOCTL message direct to the disk driver.

Answer 2

statfs() unix system call is your friend (link points to BSD man page as used in Mac OS X).