@lopos:
There is some more info about the 4GB issue on
this page.
(edit):
Forgot to say that to use the first 4GB of the harddrive without any extra stuff needed, just autodetect the size of the harddrive in HDToolBox and don't worry about wierd reported sizes. After that partition the drive and be sure to follow these rules:
1. Make the partitions smaller than 2GB.
2. Use a bit less than the _first_ 4GB of the harddrive.
/Patrik