installing grub back to MBR

Sat Nov 21 10:18:19 UTC 2015

thank you for your answer..

I have problem with the identification of the hard drive that has the MBR .

In the screen that the BIOS show me,   I see three HD:
  -    ST 3500418AS
  -    WDC WD10EZEX 60Z
  -    WDC WD50000AZRX-0

*(I have to select one of those )*
---------------------

This information say me nothing about what is the HD with MBR..

Only from the command : sudo blkid
I get :

/dev/sda1: LABEL="data_storing" UUID="080CD0150CCFFC1E" TYPE="ntfs"
PARTUUID="2c5f2c5e-01"
/dev/sdb1: UUID="4b1e5e09-306b-4c17-8c2f-653b32e1b956" TYPE="ext4"
PARTUUID="0008635c-01"
/dev/sdb2: UUID="Vtbdeq-eq6H-sbMY-Mpme-UyFk-jx77-I5Z20K" TYPE="LVM2_member"
PARTUUID="0008635c-02"
/dev/sr0: UUID="2014-05-16-21-49-27-00" LABEL="ISOIMAGE" TYPE="iso9660"
PTTYPE="dos"
/dev/sdc1: UUID="DE7CD8197CD7EA73" TYPE="ntfs" PARTUUID="f043f043-01"
/dev/sdc5: UUID="62F0169EF016790D" TYPE="ntfs" PARTUUID="f043f043-05"
/dev/mapper/fedora-swap: UUID="54d55595-8c35-4e84-8566-89d8b6f340e8"
TYPE="swap"
/dev/mapper/fedora-root: UUID="2d224b16-d37f-4eee-820a-dfcd5929e05e"
TYPE="ext4"
/dev/mapper/fedora-home: UUID="3c3f7a2e-82fa-4510-ac11-0c67fbbd85c0"
TYPE="ext4"
---------------------

I am also not sure how to interpret these data in order to know the
partition that have the MBR..

(perhaps is     /dev/sdb1 ---- ???
because is the only partition with file system EXT4   ??? )

In any case:  ... how I can individuate the HD to start at boot, knowing
the  partition
????????????

Thank you for any suggestion

On Thu, Nov 19, 2015 at 9:04 PM, stan <stanl-fedorauser at vfemail.net> wrote:

> On Thu, 19 Nov 2015 17:51:18 +0200
> Angelo Moreschini <mrangelo.fedora at gmail.com> wrote:
>
> > the command lsblk give me :
> > [angelo_user at zorro ~]$ lsblk
> > NAME            MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
> > sda               8:0    0 465.8G  0 disk
> > └─sda1            8:1    0 465.8G  0 part
> > sdb               8:16   0 931.5G  0 disk
> > ├─sdb1            8:17   0   500M  0 part /boot
> > └─sdb2            8:18   0   931G  0 part
> >   ├─fedora-root 253:0    0    50G  0 lvm  /
> >   ├─fedora-swap 253:1    0   3.9G  0 lvm  [SWAP]
> >   └─fedora-home 253:2    0 877.1G  0 lvm  /home
> > sdc               8:32   0 465.8G  0 disk
> > ├─sdc1            8:33   0  97.7G  0 part
> > ├─sdc2            8:34   0     1K  0 part
> > └─sdc5            8:37   0 368.1G  0 part
> > sr0              11:0    1    12M  0
> > rom  /run/media/angelo_user/ISOIMAGE
> >
> >
> > ----------
> > I tried:
> > ----------
> > [angelo_user at zorro ~]$ *sudo grub2-install /dev/sdb1*
> > /usr/sbin/grub2-bios-setup: warning: File system ‘ext2’ doesn't
> > support embedding.
> > /usr/sbin/grub2-bios-setup: warning: Embedding is not possible.  GRUB
> > can only be installed in this setup by using blocklists.  However,
> > blocklists are UNRELIABLE and their use is discouraged..
> > /usr/sbin/grub2-bios-setup: error: will not proceed with blocklists.
> > --------------------
> > and also :
> > [angelo_user at zorro ~]$ *sudo grub2-install /dev/sdb2*
> > /usr/sbin/grub2-bios-setup: error: unable to identify a filesystem in
> > hostdisk//dev/sdb; safety check can't be performed.
>
> The MBR is for the disk, not the partition.  So the above are incorrect.
>
> >
> >
> >
> > On Thu, Nov 19, 2015 at 5:38 PM, Angelo Moreschini <
> > mrangelo.fedora at gmail.com> wrote:
> >
> > > Hj,
> > >
> > > I arranged differently  the position of the HD(s) installed on my
> > > computer and then, because this, Fedora didn't start regularly...
> > > (at  boot I  got only the emergency prompt of GRUB).
> > >
> > >
> > > I was able to start Fedora using the "disk GRUB 2 for recovery"..
> > > I and after this  tried to install grub back to the MBR..
> > >
> > >
> > > I tried this operation using the command :
> > > grub2 install /dev/sdc
>
> This is the correct syntax to install it to the MBR of /dev/sdc.  Is
> there enough room for the larger MBR on that hard drive?  I think that
> grub2 requires at least 1 MB at the start of the drive.  What does
> fdisk show?  What offset does /dev/sdc1 start at?
>
> > >
> > > The command  ls -l /dev/sd*
> > >  give me this output :
> > > er at zorro ~]$ ls -l /dev/sd*
> > > brw-rw----. 1 root disk 8,  0 Nov 19 16:49 /dev/sda
> > > brw-rw----. 1 root disk 8,  1 Nov 19 16:49 /dev/sda1
> > > brw-rw----. 1 root disk 8, 16 Nov 19 16:49 /dev/sdb
> > > brw-rw----. 1 root disk 8, 17 Nov 19 16:49 /dev/sdb1
> > > brw-rw----. 1 root disk 8, 18 Nov 19 16:49 /dev/sdb2
> > > brw-rw----. 1 root disk 8, 32 Nov 19 16:49 /dev/sdc
> > > brw-rw----. 1 root disk 8, 33 Nov 19 16:49 /dev/sdc1
> > > brw-rw----. 1 root disk 8, 34 Nov 19 16:49 /dev/sdc2
> > > brw-rw----. 1 root disk 8, 37 Nov 19 16:49 /dev/sdc5
> > >
> > > I used the command  grub2 install /dev/sdc, thinking fedora is
> > > installed on /dev/sdc...
> > >
> > > -------------------------
> > > Actually I can start fedora only using the "disk GRUB 2 for
> > > recovery" but I would like start the computer regularly....
> > >
> > >
> > > My ask is : what is the correct value of the parameter /dev/sdX in
> > > the command grub2-install
>
> I think your issue isn't the install of grub2 on the MBR, it is the
> boot order in the bios of your computer.  The bios has to point to the
> hard drive that has the MBR you want to boot from.  So, in your case,
> you should make sure the boot order in the bios looks at /dev/sdc.  In
> most modern bioses, there is a function key you can hit to select the
> boot device at boot time.  Or a key to hit to edit the bios
> configuration.
> --
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