+@itemx --cache=@var{cache}
+The cache mode to be used with the file. See the documentation of
+the emulator's @code{-drive cache=...} option for allowed values.
+@item --aio=@var{aio}
+Set the asynchronous I/O mode between @samp{threads} (the default)
+and @samp{native} (Linux only).
+@item --discard=@var{discard}
+Control whether @dfn{discard} (also known as @dfn{trim} or @dfn{unmap})
+requests are ignored or passed to the filesystem. @var{discard} is one of
+@samp{ignore} (or @samp{off}), @samp{unmap} (or @samp{on}). The default is
+@samp{ignore}.
+@item --detect-zeroes=@var{detect-zeroes}
+Control the automatic conversion of plain zero writes by the OS to
+driver-specific optimized zero write commands. @var{detect-zeroes} is one of
+@samp{off}, @samp{on} or @samp{unmap}. @samp{unmap}
+converts a zero write to an unmap operation and can only be used if
+@var{discard} is set to @samp{unmap}. The default is @samp{off}.