Thanks Otto, this is somehow obvious, nevertheless there are tools relying on the partition layout, like disklabel (at least regarding the start of the partition).
So essentially, every start above the first sector (ie. the MBR) would be acceptable? I see that the installer suggests sector 2 as start of the disk (in fdisk), however disklabel starts wd0a at offset 64 (default), which seems kind of odd. Is there an explanation for this effect? Amit: You're right. However, as disks from about 2005 onwards are larger than this boundary, you always can _accidentally_ choose to make your boot partition too big. As the C/H/S configuration is kind of an advanced option, I'd believe in a healthy common sense of people using this option, instead of preventing them to accomplish the task they're after. Thanks in advance, /Markus