Do I have to go "Install drive" and enter the details there? If I do that should I be able to put in the same partition details as my existing partitions? It warns it will delete everything. I don't want to wipe everything on the existing partitions.
Yes, you have to go to "install drive" to increase the number of cylinders and yes, unfortunately it will delete all your partitions if you do that. So make sure you remember *all* details of your partitions before you wipe the partition table. This includes everything from the "add/update" and "change" pages (e.g. file system identifier and block size).
And make sure that you only change the number of cylinders. If you change any of the heads/sectors/blocks per cylinder values, the low cyl and high cyl values of your partitions won't match any more.
IIRC earlier versions of HDToolbox were able to change the geometry without deleting all partitions.
One could also write a small program which patches the number of cylinders in the RDB. It is just a four bytes integer value in the first block of the drive.
Bye,
Thomas
