Short answer: no.

Long answer: Java only gives you a very high-level view of the file
system. If you want to access an unmounted partition from Java, you'll
either have to write some JNI code or use Runtime.exec() to call a
native command which reads the partition data (dd if=/dev/dsk/c0t2d0s0
of=whatever etc...)

-MB

Have /you/ tried to write such a program?

In UNIX a device special file is pretty much like any other file. That's one of
the simplicities of UNIX. The device driver for that device should provide the
basic open/close/read/write functions to the kernel, so that higher level
languages can perform those operations. I presume Java only makes uses of those
native methods to access a file.

Try writing a program to read from it just like you would any binary file. Of
course, you most likely need root permission to open a block special file even
for read because you are bypassing all the filesystem level permissions on
contents of that device. And you need to be able to make sense of what you
read...

On Mon, 10 Sep 2007 07:33:38 -0700, Sébastien de Mapias
<sglrigaud@gmail.com> wrote, quoted or indirectly quoted someone who
said :

You need to write some low level accessing code in C with JNI glue..
With every passing year this gets harder and harder to write as
security in OSes tightens.

Basically all you need is a read( offset, length ) and write(offset,
length).

Keep in mind there will be many parts of the disk the OS will not let
you touch, e.g. the paging file or the bootsector. To do this sort of
thing properly, you need to use the Boot-It approach where you boot to
a very simple OS without security from CD.  Then you can do anything
you want without OS interference.

see http://mindprod.com/bgloss/bootit.html
http://mindprod.com/jgloss/jni.html