On Wednesday 03 September 2008, Javier Martín wrote: > El mié, 03-09-2008 a las 02:08 +0200, phcoder escribió: > > Hello, again. > > > > Javier Martín wrote: > > > We have 63 sectors = 32256 bytes (sectors range from 0 to 63 and the > > > first is used by the MBR). > > > > I've just rechecked on my system. My first partition begins at sector > > number 63. This is the value I've seen at most systems. So last usable > > sector is 62. Sector 0 is MBR. So we have 62 sectors > > Oops, true! How strange. So there was no sector 63 in the CHS model and > that is why the first sector of cyl 1 (the start of the first partition) > is LBA 63... Does anyone know the historical reasons for this?
Well, the point is, in CHS addressing sector numbering starts with 1, not 0, and since there are only 6 bits available for the sector number (the other 2 being used for cylinder number bits #8 and #9), the maximum number of sectors per track in CHS in 63. Regards, Niels _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org http://lists.gnu.org/mailman/listinfo/grub-devel
