Download Df.exe to display information about the drive letters in your computer.

When you type df /?, the program displays:

usage: df \[-c -b -f|-F -r|-R -w|-W  \[drive ...\]

-f : include floppy disks
-F : do only floppy disks (local only)
-c : include CD-ROMs
-r : exclude remote disks
-R : do only remote disks
-b : (bare display) no header or footer or totals
-w : display output in a Windows Messagebox

Copyright 1996, 1998, 2000 by Paul R. Sadowski <aa089>.
All Rights Reserved. Licensed for noncommercial use.</aa089>
When I ran df -r, I received:
drive  kbytes        used       avail capacity
C:\  45090983    14530740    30560243    32%    \[Volume has no label\] (ntfs)
D:\  27661615    10114359    17547255    37%    BACKUP (ntfs)
H:\    103198         359      102838     0%    \[Volume has no label\] (ntfs)
------------------------------------------------------
     72855796    24645458    48210336    33%
When I ran df -b -r, I received:
C:\  45090983    14530740    30560243    32%    \[Volume has no label\] (ntfs)
D:\  27661615    10114359    17547255    37%    BACKUP (ntfs)
H:\    103198         359      102838     0%    \[Volume has no label\] (ntfs)
NOTE: If you include floppy disks, you will get a pop-up window that you must respond to, unless there is media in the drive.