Changes between Initial Version and Version 1 of Ticket #6301, comment 8


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Timestamp:
Jul 25, 2010, 6:19:50 PM (14 years ago)
Author:
starsseed

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  • Ticket #6301, comment 8

    initial v1  
    99http://en.wikipedia.org/wiki/Master_boot_record#cite_note-8
    1010
    11 > > - since DriveSetup creates the first partition at sector CHS={01 02 00} (i.e. Cylinder=0/Head=1
    12 > /sector=2 or LBA=40) it seems it does not take care about the disk geometry. I think it's not correct : the 1st partition should be aligned on the 1st sector (2nd,3rd,4th partition should be aligned on head*sector - 1st sector/Head 0).
     11> > - since DriveSetup creates the first partition at sector CHS={01 02 00} (i.e. Cylinder=0/Head=1/sector=2 or LBA=40) it seems it does not take care about the disk geometry. I think it's not correct : the 1st partition should be aligned on the 1st sector (2nd,3rd,4th partition should be aligned on head*sector - 1st sector/Head 0).
    1312>
    1413> I believe we don't even know the actual disk geometry at this point, let alone that it probably cannot be represented with the limited CHS scheme anyway. Does anyone even care about these alignments still?
    … …  
    6362}}}
    6463
    65 here are the rules used by some partitionning tools.
     64here are the rules used by some partitioning tools.
    66651. If the first sector of the cylinder is a partition table sector, then the rest of the track is unused, and the partition starts with the the next track. This applies to sector 0 (the MBR) and the partition table sectors preceding logical partitions.
    67662. Otherwise, the partition starts at the first sector of the cylinder. Also the extended partition starts at a cylinder boundary