> Can't open /dev/rsd4a: Device not configured

As someone posted earlier, it should be /dev/rsd2a, not 4 since the 
CD-ROM's are now on /dev/cd

> That's it.  Anyway what's the difference between sd4a and rsd4a?

The /dev/sd4a is the block interface to the disk, the /dev/rsd4a is the 
raw (character) interface to the disk.

Later.

-- 
Colin Wood                                      ender@is.rice.edu
Consultant                                        Rice University
Information Technology Services                       Houston, TX