Recover old Sider II drive?

[tcp277@yahoo.com (C. Todd)]

Hello.. Just wanted to probe the knowledge of the group here...

I have an old Sider II 20mb hard drive from years gone by.. The last
time I remember it actively working was about 10 years ago.

I was able to boot it up last christmas -- (it doesn't boot
independently, I needed to start up with a ProDOS disk).. I was able
to read the root directory, but couldn't get anywhere past that; it
would either freeze or spit out an error (I'm sorry I don't recall the
error - I think it may have just been the generic I/O ERROR message)
when I tried to run anything or explore the drive any deeper..

Is there any hope of recovery? Does anyone perhaps specialize in this?
I'm in the Washington, DC area.. I remember reading something about
someone in this area who specialized in such things about a year ago,
but I've lost all information on them..

Thanks in advance for any help..

-C. Todd