I had the same problem, for a different reason though. The problem is that you hard drive partitioning is different from the original Z's configuration. Just a system alert, and does not actually prevent starting the Z.
for Zaurus C3200
Solution 1 - Once you see the hdd1 error you can simply press Ctrl+C+D and the Z will start. Easy right? If you plan to keep using a Sharp based rom I would suggest using solution 2 because it can be annoying to have to press Ctrl+C+D everytime you boot up. Using Angstrom or pdaXrom rom will also stop this because the Z will not complain about partition tables on startup.
Solution 2 - Download the file http://www.trisoft.de/download/SLC3200SYSPART.zip
. This file contains instructions and the files needed in order to manually partition the 6GB hard drive and restore it to it's original condition.