Partition table entries are not in disk order Partition 7 does not start on physical sector boundary. Partition 6 does not start on physical sector boundary. Partition 5 does not start on physical sector boundary. I/O) size boundary is recommended, or performance may be impacted.ĭisk /dev/sda: 1000.2 GB, 1000204886016 bytesĢ55 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors Aligning to a physical sector (or optimal The device presents a logical sector size that is smaller than M command in fdisk will print help sudo fdisk /dev/sda Then, access your HDD using sudo fdisk device_name. are not.įor your new HDD, first create partitions using gparted as per your wish.
Technically, you can set the start to any logical sector which is a multiple of 8, e.g. If not, backup all important data first, and then use Gparted to move the partition so that it starts at 4096-byte sector setting the start boundary at 1 MiB is an easy way to do it. If you are happy with the performance now, ignore the warning, and no need to do anything. In theory this sort of partitioning may affect read/write IO rates somewhat, depending on your drive's firmware. Thus, the warning occurs because partition 1 starts at logical sector 63 = byte 32256, a number not divisible by 4096 in fact it's near the end of the 7th physical sector (position 7.875 to be exact :) Should you fix it? If so, how? They have an extensive page with lots of information on it, which you may wish to look at. In fact, lshw shows it's a Western Digital drive, the first company to switch to AF. These HDDs can still provide a "legacy" emulation of 512 bytes/sector, which is why you see the logical sector size as 512. Your hard disk is one of the newer models which uses the Advanced Format of 4096 bytes per physical sector instead of the older 512 bytes/sector. This line explains the warning: Sector size (logical/physical): 512 bytes / 4096 bytes Your hard disk has Advanced Format 4096-byte sectors to which the partition is not perfectly aligned These are related /etc/fstab lines: UUID=cc5c562a-bc59-4a37-b589-805b27b2cbd7 / ext3 errors=remount-ro,user_xattr 0 1 Serial: 16a7fee0-be9e-4e34-9dc3-28f4eeb61bf6Ĭapabilities: primary nofs swap initializedĬonfiguration: filesystem=swap pagesize=4096 Serial: cc5c562a-bc59-4a37-b589-805b27b2cbd7Ĭapabilities: primary bootable journaled extended_attributes large_files recover ext3 ext2 initializedĬonfiguration: created= 09:18:28 filesystem=ext3 modified= 18:33:59 mount.fstype=ext3 mount.options=rw,relatime,errors=remount-ro,user_xattr,barrier=1,data=ordered mounted= 00:20:47 state=mounted .png "openzfs correct ashift for advance format drives")
Partition 1 does not start on physical sector boundary. I/O size (minimum/optimal): 4096 bytes / 4096 bytesĭispositivo Boot Start End Blocks Id System Sector size (logical/physical): 512 bytes / 4096 bytes What is the cause and do I need to fix it? If so, how? I have one HDD on my laptop, with two partitions (one ext3 with Ubuntu 12.04 installed and one swap).įdisk is giving me the following warning: Partition 1 does not start on physical sector boundary
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