On 06/09/2014 04:10, Joseph wrote:
On 09/05/14 21:02, Joseph wrote:
I'm configuring MBR partition for older disk and need to know what
code to enter for boot partition.
My BIOS is not EFI type.
Not that it particularly matters but a partition dedicated to /boot
contains a Linux filesystem and, thus, 83 is appropriate.
My current configuration:
fdisk -l /dev/sda
Disk /dev/sda: 447.1 GiB, 480103981056 bytes, 937703088 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x021589e5
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 155647 76800 83 Linux
/dev/sda2 155648 4349951 2097152 82 Linux swap / Solaris
/dev/sda3 4349952 937703087 466676568 83 Linux
Does the sda1 has to start with "1" or 2048?
As of util-linux-2.18, partitions are aligned to 1 MiB boundaries by
default, so as to avoid performance degradation on SSDs and advanced
format drives [1].
Further, beginning at 2048 as opposed to 63 (in the manner of MS-DOS)
provides more room for boot loaders such as grub to embed themselves.
To have the first sector be a partition boundary is impossible because
that is the location of the MBR and the partition table.
In summary, let it be.
--Kerin
[1] https://bugs.gentoo.org/show_bug.cgi?id=304727
[2] https://en.wikipedia.org/wiki/Master_boot_record
