Is "fdisk" or "sfdisk" lying to me? Or both? Below is the output of both "fdisk" and "sfdisk". Nobody makes sense.
Both claim the different geometry (heads, sectors/track) and a differing number of cylinders. Yet both pretty much agree on the ending cylinder of sda1. With the number of heads disagreeing, almost nothing should line up. fdisk ----- fdisk claims cylinders are made up of 15120 blocks of 512 bytes yielding 7741440 bytes per cylinder. Yet, doing a cylinder computation of sda1 gives: Blocks/(blocks/cylinder) 51309688/15120 = 3393.49 (Because some partitions start/stop on non-cylinder boundaries fractions are expected here) This value is half the expected value of 6786. If a block is actually 1024 bytes (as sfdisk claims and bytes per cylinder still 7741440) then the blocks per cylinder would be 7560 making the computation: 51309688/7560 = 6786.99 which is the about the expected value. sfdisk ------ sfdisk claims cylinders are made up of 8225280 bytes in blocks of 1024 bytes (yielding 8032.5? blocks per cylinder). This looks line the number of bytes per cylinder is off by half a block. Cylinder size in bytes and in blocks should be consistent with each other. Anybody got an idea of what is going on here? Am I doing the computations wrong? # fdisk -l /dev/sda Disk /dev/sda: 250.0 GB, 250059350016 bytes 240 heads, 63 sectors/track, 32301 cylinders Units = cylinders of 15120 * 512 = 7741440 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 6787 51309688+ 7 HPFS/NTFS /dev/sda2 31334 32301 7318080 7 HPFS/NTFS /dev/sda3 6788 8142 10243800 83 Linux /dev/sda4 8143 31333 175323960 f W95 Ext'd (LBA) /dev/sda5 8143 8420 2101648+ 82 Linux swap / Solaris /dev/sda6 8421 11129 20480008+ 83 Linux /dev/sda7 11130 13838 20480008+ 83 Linux /dev/sda8 13839 19256 40960048+ 83 Linux /dev/sda9 19257 24674 40960048+ 83 Linux Partition table entries are not in disk order # sfdisk -lq /dev/sda Disk /dev/sda: 30401 cylinders, 255 heads, 63 sectors/track Warning: extended partition does not start at a cylinder boundary. DOS and Linux will interpret the contents differently. Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0 Device Boot Start End #cyls #blocks Id System /dev/sda1 * 0+ 6387- 6388- 51309688+ 7 HPFS/NTFS /dev/sda2 29489+ 30400- 912- 7318080 7 HPFS/NTFS /dev/sda3 6387+ 7663- 1276- 10243800 83 Linux /dev/sda4 7663+ 29489- 21827- 175323960 f W95 Ext'd (LBA) /dev/sda5 7663+ 7924- 262- 2101648+ 82 Linux swap / Solaris /dev/sda6 7924+ 10474- 2550- 20480008+ 83 Linux /dev/sda7 10474+ 13023 2550- 20480008+ 83 Linux /dev/sda8 13024+ 18123- 5100- 40960048+ 83 Linux /dev/sda9 18123+ 23222- 5100- 40960048+ 83 Linux # For those that want disk ordering of the partitions # fdisk -l /dev/sda | tr '*+-' ' ' | grep ^/dev | sort -nk 2 /dev/sda1 1 6787 51309688 7 HPFS/NTFS /dev/sda3 6788 8142 10243800 83 Linux /dev/sda4 8143 31333 175323960 f W95 Ext'd (LBA) /dev/sda5 8143 8420 2101648 82 Linux swap / Solaris /dev/sda6 8421 11129 20480008 83 Linux /dev/sda7 11130 13838 20480008 83 Linux /dev/sda8 13839 19256 40960048 83 Linux /dev/sda9 19257 24674 40960048 83 Linux /dev/sda2 31334 32301 7318080 7 HPFS/NTFS FYI: the disk was partitioned using Partition Magic - Bill Morita wamorita At hevanet.com _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
