Messages in this thread | | | Date | Sun, 4 Jul 2004 01:02:04 +1000 | From | Andrew Clausen <> | Subject | Re: [RFC] Restoring HDIO_GETGEO semantics (was: Re: workaround for BIOS / CHS stuff) |
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On Sat, Jul 03, 2004 at 03:40:01PM +0100, Anton Altaparmakov wrote: > > XP home edition (the green box) > > Hm, I only ever tried XP Pro.
I guess we can try diff'ing the bootstrap code. Should probably do this in private for copyright reasons...
> > > Does it use NTFS as both the boot and system drive? > > > > I am using a single NTFS partition. > > I have lots of partitions (mostly Linux, NTFS is at end of disk).
If NTFS is at the end of the disk, doesn't it have to use LBA to address it?
> > Note: I reversed-engineered the Windows FAT bootstrap code. My analysis > > is contained in the file doc/FAT in the Parted source distribution. I > > concluded that Windows uses LBA if the LBA flag is set in the boot > > partition table entry. (i.e. the partition type includes LBA in the > > fdisk codes - this corresponds to a bit being set) > > Interesting. Maybe I don't have this bit set?
This bit only applies to FAT, AFAIK. There is no corresponding bit for NTFS.
> > > u16 sectors_per_track; /* Required to boot Windows. */ > > > u16 heads; /* Required to boot Windows. */ > > > u32 hidden_sectors; /* Offset to the start of the partition relative > > > to the disk in sectors. Required to boot Windows. */ > > > > I just set the first 2 of these fields to 0, and everything still works. > > Am I blessed? (Or perhaps cursed!) > > Odd. Messing up any of the above three values makes my XP Pro fail to > boot!
Interesting. How is your BIOS configured? (LBA, Auto, CHS or Large? what CHS values?)
Cheers, Andrew
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