[gentoo-user] Re: Partition of 3TB USB drive not detected

[Jörg Schaible]

Jörg Schaible wrote:

> Hi Daniel,
>
> thanks for your response.
>
> Daniel Frey wrote:
>
> [snip]
>
>> I can only think of two reasons, the kernel on the livecd doesn't
>> support GPT (which is unlikely)
>
> That would be really strange. However, how can I prove it?
>
>> or you're booting a 32-bit kernel live
>> USB. I am reasonably certain for drives > 2TB a 64-bit kernel and GPT
>> are required.
>
> No, I've always chosen 64-bit kernels. I wonder what is so special about
> this partition ...

Currently I wonder, why my system can find the partition at all:

======================== %< ========================
# gdisk -l /dev/sdi
GPT fdisk (gdisk) version 1.0.1

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: not present

Creating new GPT entries.
Disk /dev/sdi: 732566646 sectors, 2.7 TiB
Logical sector size: 4096 bytes
Disk identifier (GUID): 80C04475-9B51-4A44-A52F-1F165AE02695
Partition table holds up to 128 entries
First usable sector is 6, last usable sector is 732566640
Partitions will be aligned on 256-sector boundaries
Total free space is 732566635 sectors (2.7 TiB)

Number  Start (sector)    End (sector)  Size       Code  Name
======================== %< ========================

However, it's mounted successfully, see system logs:

======================== %< ========================
[22735.626752] sd 13:0:0:0: [sdi] 732566646 4096-byte logical blocks: (3.00 
TB/2.73 TiB)
[22735.629255]  sdi: sdi1
[23414.066315] EXT4-fs (sdi1): mounted filesystem with ordered data mode. 
Opts: (null)
======================== %< ========================

Has anyone ever tried the recovery option of GPT disk to rebuild GPT from 
MBR?

- Jörg