Harddrive manufacturers count GBs of capacity as 1GB = 1*10^9Bytes (1000* 1000 * 1000 Bytes), whilst computers count GBs of capacity as 1GB = 2^30Bytes (1024 * 1024 * 1024 Bytes).
So: (18.2 * 1000 * 1000 * 1000) / (1024 * 1024 * 1024) = 16.95GB.
I cannot explain the 16.0GB though, except that HDToolBox can be a bit wanky sometimes. More important though - did you loose the last partition?
With 20MHz SE SCSI as the CSPPC is capable of, the maximum bus-length is 1.5M and it is from end to end which counts. In my experience this 20MHz SE SCSI is rather sensitive and I have had troubles with my previous cabling which was somewhere between 1 - 1.5M, even if the harddrive was very close to the controller (the terminators at the ends were still far from the controller and harddrive), so try a shorter cable and see if it makes any difference.
You should not need to set the drive to force SE mode, as only SCSI equipment manufactured wrong wont autosense.
Also, do you have
the most recent official CSPPC firmware? Else the older drivers can be a source of issues with the SCSI bus.
/Patrik
