How do I partition a big disk (>4GB) ?

There are a number of ussues to consider. 

Firstly you need to decide which version of PFS-2 you are going to use.  The standard version supports TD64.  If you know that your controller card supports this new standard then you can keep using the standard version of PFS-2 if not you will have to change over to the direct SCSI version.  This will involve replacing/upgrading all partitions to use L:PFS2DS instead of L:PFS2.  When you have done this - reboot so that the direct SCSI version is active.

When you first install a disk drive you have to use HDToolbox to set it up. 

The first job is to introduce this "type" of drive to HDToolbox.  To do this start HDToolbox, select the drive and click on the "change drive type" button.  Click on the "read configuration" button.  This will load the drive geometry.  Look at this information.  The drive size will be wrong but the other parameters are correct.  It is these values that are written to the disk (RDB) not the total.  Click to the "ok" button to return to the drive type screen.  Click on the "ok" button to return to the main screen.

The next job is to partition the drive.  HDToolbox will automatically create 2 FFS partitions for you.  You can keep this configuration or change it.  In any case you are likely to want to change the filesystem picked.  The partition size will be wrong for large partitions (>4GB).  Ignore this.  Click on the "advanced options" box.  The geometry (cylinder) paramters are correct.  You will have to work out the partition sizes yourself !

Remember to save what you have done.  HDToolbox will reboot your machine.   When it comes back up format the partitions.