Camilo Mesias wrote: > > The output of sfdisk -l doesn't make it obvious if the disk is using > 4k sectors or is aligned in any particular way. [...] > > Disk /dev/sda: 7297 cylinders, 255 heads, 63 sectors/track > Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0 > > Device Boot Start End #cyls #blocks Id System > /dev/sda1 * 0+ 63- 64- 512000 83 Linux > /dev/sda2 63+ 7297- 7234- 58101760 8e Linux LVM > /dev/sda3 0 - 0 0 0 Empty > /dev/sda4 0 - 0 0 0 Empty IMHO it makes obvious that it is extremely bad aligned. C/H/S are all odd numbers (that is, not even). The important partition (sda2) starts at 63, which is off alignment. I don't know if your drive is one of the "let's shift every sector by one to make MSDOS..WINXP aligned". If the SSD is not doing tricks, this layout is misaligned. I partitioned my SSD in the following way. I forced 56 as sector/track (which is dividable by 8, 4096/512), so all partitions should come out 4KiB aligned. (used both CHS and sector output for clarity) No guarantee that my approach is right and that your SSD is wrong. :-) # fdisk -l /dev/sda Disk /dev/sda: 256.0 GB, 256060514304 bytes 54 heads, 56 sectors/track, 165383 cylinders Units = cylinders of 3024 * 512 = 1548288 bytes Disk identifier: 0x180397b2 Device Boot Start End Blocks Id System /dev/sda1 * 1 1 1484 83 Linux /dev/sda2 2 165383 250057584 5 Extended /dev/sda5 2 476 718172 83 Linux /dev/sda6 477 38620 57673700 83 Linux /dev/sda7 38621 42782 6292916 82 Linux swap / Solaris /dev/sda8 42783 98263 83887244 83 Linux /dev/sda9 98264 165383 101485412 83 Linux # fdisk -l -u /dev/sda Disk /dev/sda: 256.0 GB, 256060514304 bytes 54 heads, 56 sectors/track, 165383 cylinders, total 500118192 sectors Units = sectors of 1 * 512 = 512 bytes Disk identifier: 0x180397b2 Device Boot Start End Blocks Id System /dev/sda1 * 56 3023 1484 83 Linux /dev/sda2 3024 500118191 250057584 5 Extended /dev/sda5 3080 1439423 718172 83 Linux /dev/sda6 1439480 116786879 57673700 83 Linux /dev/sda7 116786936 129372767 6292916 82 Linux swap / Solaris /dev/sda8 129372824 297147311 83887244 83 Linux /dev/sda9 297147368 500118191 101485412 83 Linux -- Roberto Ragusa mail at robertoragusa.it -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
