Re: The backup GPT table is corrupt
On Wed 13 Aug 2025 at 19:40:07 (+0100), mick.crane wrote:
> root@courgette:/home/mick# gdisk -l /dev/sda
> GPT fdisk (gdisk) version 1.0.9
>
> Caution: invalid backup GPT header, but valid main header; regenerating
> backup header from main header.
>
> Warning! One or more CRCs don't match. You should repair the disk!
> Main header: OK
> Backup header: ERROR
> Main partition table: OK
> Backup partition table: OK
>
> Partition table scan:
> MBR: protective
> BSD: not present
> APM: not present
> GPT: damaged
>
> ****************************************************************************
> Caution: Found protective or hybrid MBR and corrupt GPT. Using GPT,
> but disk
> verification and recovery are STRONGLY recommended.
> ****************************************************************************
> Disk /dev/sda: 234441648 sectors, 111.8 GiB
> Model: V Series SATA SS
> Sector size (logical/physical): 512/512 bytes
> Disk identifier (GUID): CEC0C0B6-A933-426A-921B-04BDA99E808B
> Partition table holds up to 128 entries
> Main partition table begins at sector 2 and ends at sector 33
> First usable sector is 34, last usable sector is 234441614
> Partitions will be aligned on 2048-sector boundaries
> Total free space is 2925 sectors (1.4 MiB)
>
> Number Start (sector) End (sector) Size Code Name
> 1 2048 1050623 512.0 MiB EF00
> 2 1050624 232441855 110.3 GiB 8300
> 3 232441856 234440703 976.0 MiB 8200
> root@courgette:/home/mick#
>
> There's just the one OS on this disk. Possibly my changing the disk
> from MBR to GPT caused some error.
It's quite likely that the last 34 sectors of the disk were never
written or read when the format was MBR, so you wouldn't know whether
the error had been present or not.
Cheers,
David.
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