Processes marked "D" are in uninterruptible sleep, and they mean it.
Their sleep is uninterruptible. :) Typically this means they are waiting
for a hardware event. Most common are NFS and floppy-disk mounts that
disappeared without being unmounted. But sometimes a confused device
driver (for a scanner, for example) can leave a process in D. There isn't
really any way to get rid of these, other than resolving the hardware
blockage or, as a last resort, rebooting.
Fortunately, D processes don't take up any resources, with the exception
of files they might have left open, and a smattering of RAM. (A good
reason to have at least a couple of MB of swap lying about!) :)
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