ubunutu 14.04 boots to grub prompt seagate hybrid drive

[schnemart]

Hello
I have a ubuntu 14.04 desktop which was running for 6 months
with a boot drive being a seagate Hybrid drive .

I have tried using using boot-repair booted from a USB but when I start the system just reboots

I have plug the drive into another box and ran the seagate short test and it says all ok

please help

regards
Martin

[schnemart]

Just to clarify the system boots and goes straight to grub prompt

[wildmanne39]

Thread moved to Installation & Upgrades. You will be more likely to get the help you need in the section of the forum!

[yancek]

I have tried using using boot-repair booted

Boot repiar has an option to Create BootInfo Summary. Run that and post the output here as it will give a lot of details on your system.

[schnemart]

Hi Yancek
Thanks for your reply
I got boot repair report to work and it told me to post this http://paste2.org/nHv3K0ew

regards
Martin

[oldfred]

It is very strange that it shows gpt partition and all the partition table errors.
I have seen similar errors with MBR(msdos) where the logical partitions have a invalid link to next logical partition and create a infinite loop.
I thought gpt was better as it does more internal checking and has a backup.

Post this, you may have to install gdisk.
sudo apt-get install gdisk
sudo gdisk -l /dev/sda

And if fixable, posts from developer of gdisk:
http://askubuntu.com/questions/460233/cant-restore-my-gpt-data-with-gdisk
http://askubuntu.com/questions/386752/fixing-corrupt-backup-gpt-table/386802#386802

GPT fdisk Tutorial - user srs5694 in forums
http://ubuntuforums.org/showthread.php?t=1439794
http://www.rodsbooks.com/gdisk/

[schnemart]

Hi Oldfred

I am in the process of backing up the disk with GNUddrescue and this has taken longer than I liked
I will get pack with the results of sudo gdisk -l /dev/sda
thanks for your help
regards
martin

[schnemart]

Hello Oldfred
I ran gdisk -l /dev/sdb ( i have pulled out the drive and attached it to my other box)

and this is the result
GPT fdisk (gdisk) version 0.8.8


Caution: invalid main GPT header, but valid backup; regenerating main header
from backup!

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/sdb: 7814037168 sectors, 3.6 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 52B26C6A-412A-4DAD-B51E-DC40772A93A7
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 7814037134
Partitions will be aligned on 2048-sector boundaries
Total free space is 3693 sectors (1.8 MiB)

Number Start (sector) End (sector) Size Code Name
1 2048 1050623 512.0 MiB EF00
2 1050624 7780700159 3.6 TiB 8300
3 7780700160 7814035455 15.9 GiB 8200

your thoughts and thanks
Martin

[schnemart]

Hi OldFred

Further to the above post

after reading the posts that was included above above I
I ran gdisk /dev/sdb v which was ok
I then ran gdisk /dev/sdb w which must of made the recovery of "Caution: invalid main GPT header, but valid backup; regenerating main header
from backup!"

Permanent

Thus it worked

Which is good
I wonder if anyone else has had trouble with Hybrid SDD / stand drives ?
any way thanks for your help
I am now making a backup of data and lets see how it goes
again thanks