debian installer 4k sectors

[Pavel Kosina <peekaa@email.cz>]

Hi,

several times I tried install Debian stable/testing. I have MB Asrock 
UEFI D1800B-ITX and HDD WD20EFRX. Debian installer /part where 
partitioning and formatting happens/ never formats to correct sectors 
4k. It always formats to 512b:
----------------------
linuxbox:~# fdisk -l
Disk /dev/sda: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0xa10b2c0d

Device     Boot      Start        End    Sectors  Size Id Type
/dev/sda1  *          2048 3903531007 3903528960  1.8T 83 Linux
/dev/sda2       3903533054 3907028991    3495938  1.7G  5 Extended
/dev/sda5       3903533056 3907028991    3495936  1.7G 82 Linux swap / 
Solaris

Partition 2 does not start on physical sector boundary.
-----------------------------


why is that? Is that bug or I miss something?
Due to this there is also error: "Partition 2 does not start on physical 
sector boundary."

Thank you
Pavel