Installer: no option to set geometry/corrupts partition table
Simon 'corecode' Schubert
corecode at fs.ei.tum.de
Mon Mar 5 02:27:05 PST 2007
On 05.03.2007, at 04:04, randux at noreply.org wrote:
It's tangential that modern machines 'don't use' c/h/s; the issue is
that the partition table is designed around c/h/s values and that's
how space gets allocated. When you use fdisk you can certainly
allocate things in terms of tracks or cyls or megs or what have you,
but the partition table contains c/h/s values and the map is built
around this geometry. There's no other common point of control for
multiple OS coexistence; how else can partition boundaries be
There is simply *no way* to address more than 8 GB with CHS. After
that you're simply out of bits. You have two options after that:
either fill all bits with ones to mark that you reached this limit, or
you simply don't care about the additional bits and wrap around the
What is the result of this? You *have* to use logical block
addressing. And really, once you're there, you can't care less about
CHS values and alignment anymore.
However, I do agress that changing existing table values is a really
bad thing, so the installer shouldn't do this in any case.
All the other BSDs installers make provisions for preventing
this...that being the case, I don't understand the skepticism or the
surprise! It hardly seems reasonable that all these other variants
make a provision to deal with an issue that is obsolete or irrelevant.
Rather, it seems extremely critical. If I understand correctly that
the DFly installer was taken from the FreeBSD installer, then I am
hoping it will be a very simple matter to add the G option to DFly's
No, you are mistaken. The DragonFly installer is really the
BSDinstaller, but a rather oldish version. Possibly you mistake the
source of scepticism. We're just too few people to do everything
people could possibly need. If you want to fix this issue, please go
ahead! We appreciate every helping hand!
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