Partition 2 does not start at the edge of the physical sector

Sergio Rodriguez

New Member
Mar 9, 2019
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I ran the fdisk command to see how my disk is partitioned and got the following result.

Disk /dev/sda: 698,7 GiB, 750156374016 bytes, 1465149168 sectores
Units:  1 * 512 = 512 bytes sectors
Sector size (logical/physical) 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Type of disc label: two
Disk Identifier: 0xbb937d59
Disposit.  Start Start End Sectors Size Id Type
/dev/sda1  *          2048   48828415   48826368  23,3G 83 Linux
/dev/sda2         48830462 1465147391 1416316930 675,4G  5 Extendida
/dev/sda5         48830464   68360191   19529728   9,3G 83 Linux
/dev/sda6         68362240   76412927    8050688   3,9G 82 Linux swap / Solaris
/dev/sda7         76414976   80318463    3903488   1,9G 83 Linux
/dev/sda8         80320512 1465147391 1384826880 660,3G 83 Linux

Partition 2 does not start at the edge of the physical sector.

What caught my attention was the last red phrase in the terminal:

Partition 2 does not start at the edge of the physical sector.

What does it mean? Is it serious?

Thanks in advance for your help!

The brief answer is "No", Sergio :)

The difference between 48826368 and 48830462 is 4,094 which is 4,096 less 2, a significant clue.

Do I take it this is still Debian? Always helps to name your Distro.

You are on an MBR (Master Boot Record) partitioning as opposed to GPT (GUID Partition Table). The limit on MBR of Primary Partitions is 4, and if four were used, the partitions would follow on consecutively.

We usually choose either Partition 3 or Partition 4 (preferably 4) to make an Extended Partition, under which at least 15 Logical Partitions can then be used for Linuxes. In your case, you have chosen Partition 2 to be extended, and so 3 and 4 are skipped, and then 5 through 8 are Logical.

Once we leave the Primary Partition environment, sectors do not follow exactly consecutively, because of needing to allow for MBR overheads at the start of the Extended Partition, so they are not edge to edge.



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