On 07/16/2017 04:25 PM, Patrick Dupre wrote:
I have a hard drive startaing at 63

Partition 1 does not start on physical sector boundary.
1+0 records in
1+0 records out
dev/sdb1  *           63    2050047    2049985  1001M  c W95 FAT32 (LBA)
/dev/sdb2         2050048   14338047   12288000   5.9G 83 Linux

Can I fix it easily?

Fix what?

Actually, this was the initial disk of the computer which came
with a fat32 partition
Can I backup the partition, and modify the partition table for
this partition only without any trouble?

I don't understand what you're trying to do, but the direct answer to those questions is yes.

I guess that it is a boot partition recognized by grub

You got the computer without Windows installed? The default in that case is often freedos, which appears to be what grub detected it as.

In addition, sdb2 is seen as a linux partition by fdisk,

fdisk just tells you what the partition is marked as in the partition table.

but as a ntfs partition by gparted (and testdisk). I guess that it correct.

gparted and testdisk actually probe the filesystem because they also deal with the contents of the partitions.

     HPFS - NTFS            127 155 29   892 128  4   12288000
      NTFS, blocksize=4096, 6291 MB / 6000 MiB

fsck /dev/sdb2
fsck from util-linux 2.28.2
Unsupported: replay_log()
Volume is dirty.
Unsupported: check_volume()
Checking 4096 MFT records.
Unsupported cases found.
ntfsck was unable to run properly.

  ntfs-3g.probe /dev/sdb2
ERROR: ntfs-3g.probe: Probe type is missing

But, I can mount it.

If you can mount it as ntfs and see files, then I guess it's ntfs.
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