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Re: Why start the first partition at 2 MIB, why not at any multiple of 4096 bytes ...



On 2020-09-09 23:02, David wrote:
On Thu, 10 Sep 2020 at 11:26, David Christensen
<dpchrist@holgerdanske.com> wrote:
On 2020-09-09 08:03, David Wright wrote:

... having been bitten by
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=923561

I have a 300 GB drive that has been causing me some confusion.  Did I
elicity the bug when I partitioned the disk as follows?

I have not read all relevant messages, but in case it helps you can
check your exact device partition boundaries by running:

parted /dev/disk/by-id/ata-ST3300622AS_******** 'unit compact print
free unit s print free unit b print free'

That parted(8) incantation has issues, as does the disk:

2020-09-10 14:00:52 root@tinkywinky ~
# parted /dev/disk/by-id/ata-ST3300622AS_******** 'unit compact print free unit s print free unit b print free' Error: The backup GPT table is corrupt, but the primary appears OK, so that will be used.
parted: invalid token: unit
OK/Cancel? ok
Model: ATA ST3300622AS (scsi)
Disk /dev/sdb: 300GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system  Name      Flags
        17.4kB  1049kB  1031kB  Free Space
 1      1049kB  300GB   300GB   ext2         ********
        300GB   300GB   139kB   Free Space


This is how I invoke parted(8):

2020-09-10 14:01:58 root@tinkywinky ~
# parted /dev/disk/by-id/ata-ST3300622AS_******** unit s print free
Error: The backup GPT table is corrupt, but the primary appears OK, so that will be used.
OK/Cancel? ok
Model: ATA ST3300622AS (scsi)
Disk /dev/sdb: 586072368s
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start       End         Size        File system  Name      Flags
        34s         2047s       2014s       Free Space
 1      2048s       586072063s  586070016s  ext2         ********
        586072064s  586072334s  271s        Free Space



Looking at the above information, my first partition starts at sector 2048 and ends at sector 586072063 (inclusive). Both of these values represent 1 MiB alignment, so it appears that the partition has not been affected by bug 923561.


David


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