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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _dos_getdiskfree routine uses system call 0x36 to obtain
     information on the disk drive specified by <drive>. The default
     drive is 0, drive A is 1, drive B is 2, and so on. Information is
     returned in the _diskfree_t structure (defined in DOS.H) pointed
     to by <diskspace>.
 
     Return Value
 
     If successful, the function returns 0. Otherwise, it returns a
     nonzero value and sets errno to EINVAL, indicating that an invalid
     drive was specified.
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