Look at the code more closely...
If DriveType = DRIVE_REMOVABLE Then
ret = SHFormatDrive(hWndOwner,DriveNum,SHFMT_ID_DEFAULT, SHFMT_OPT_FULL)
Else
MsgBox "This is not a floppy drive!",vbExclamation, "Format Floppy Disk"
End If
The above IF/THEN statement simply checks...