Hi all!
I have three different behaviour questions regarding alignment (I've confirmed
the behaviour with git master and a test file):
First, if I create a new partition on an empty device, fdisk appropriately
uses 1MB offset from beginning by default:
"First sector (2048-10239999, default 2048):"
However, shouldn't it still allow using a lower starting sector, even if not
selected by default? Like this:
"First sector (63-10239999, default 2048):"
Or is the intent to protect against users messing up the alignment, and users
should use dos compatibility mode to avoid the limitation? I guess I would be
ok with that :)
Ok, I then create the primary partition starting in sector 2048 and and select
partition size '+5500K' for a 5,5MB partition:
Device Boot Start End Blocks Id System
/dev/loop0p1 2048 13047 5500 83 Linux
Looks ok. Now, when I ask fdisk to create another partition, fdisk offers to
start it immediately after the end of the previous partition:
"First sector (13048-10239999, default 13048):"
Is it intended that fdisk doesn't align the default value to 14336?
I've gotten bitten by this several times and I've created unaligned partitions
on 4k sector devices.
I.e. what I would've expected:
"First sector (13048-10239999, default 14336)":
Thirdly, I create an extended partition with one logical partition as follows:
Device Boot Start End Blocks Id System
/dev/loop0p1 2048 13047 5500 83 Linux
/dev/loop0p2 13048 14335 644 83 Linux
/dev/loop0p3 14336 10239999 5112832 5 Extended
/dev/loop0p5 16384 65534 24575+ 83 Linux
Now, I wish to add another logical partition:
"First sector (67583-10239999, default 67583):"
fdisk suggests 67583 as the starting point, which is exactly 1MB after the end
of the previous logical partition, but in no way aligned. Why is there such an
offset, and why does it happen only with logical partitions?
I would've expected:
"First sector (65535-10239999, default 65536):"
Thanks in advance for any explanations,
--
Anssi Hannula
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