short thing: I've done something I didn't know what happens; bad thing: I did it with my partition table.
My OS is Ubuntu 10.10. I've used GPT and now want to convert it to MBR with gdisk.
I started gdisk, chose 'r' for "transformation options" and chose 'g' to "convert GPT into MBR and exit".
Then I rebooted. Now all my programs tell me something other:
fdisk says the following (language is german):
Code:
Gerät boot. Anfang Ende Blöcke Id System
/dev/sda1 1 121602 976762583+ ee GPT
gdisk says it to be a protective MBR, but '-l' switch doesn't print any partition:
Code:
GPT fdisk (gdisk) version 0.5.1
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.
The kernel doesn't seem to detect anything, only sda* thing is /dev/sda.
partitionmanager says that there is no valid partition table.
Now, what should I do? Stupid thing is that I missed to make a backup of my first sectors before.
Remember, the only thing I want is to be able to read my partitions on sda again and to have an MBR on it in the end.
Blackbird
Last edited by Blackbird; 11-09-2010 at 04:31 PM..
hello community,
i have problems with my redhat enterprise linux 4 nanhant 6 and my easyraid x8s (8x1tb) extern fibre channel raid
extern raid configuration:
raid level 5 (8x1tb)
redhat system shows me four 2tb partitions and one 450gb partition from my raid :(
why?????
i have... (1 Reply)
Hi,
I just built myself a new machine which has an ASUS motherboard with is UEFI based.
I noticed after I installed Fedora 17 that my sda is MBR and my sdb is GPT:
sda is a ssd drive. Should the ssd drive be GPT or is MBR okay?
sda is 60Gb drive. (3 Replies)
Hello,
My hard drive was formatted with GPT. It is part of a volume group and has two logical volumes on it. Is it possible to convert the drive to MBR? If so, how would I got about doing it? I know there are programs out there that do it, but I have volume groups with LVM's so I am wondering if... (1 Reply)
(Don't you hate being on holiday and being the only IT person in the family?)
Got a wonderful thanksgiving surprise .. dead windows-8 laptop with "important" unbacked-up data. No worries, I have my my fedora labtop and a magical SATA to USB converter. Plugged in the drive, and ... can't mount... (4 Replies)
rying it this way, because I can't handle the slices for the second hdd. If there is someone on this forum who can help me out of that misery, he would really save my digital life in this digital ocean.
So not giving up, reading several times the manual of gpart. But the best hint in all that... (0 Replies)
Discussion started by: 1in10
0 Replies
LEARN ABOUT FREEBSD
zfsboot
ZFSBOOT(8) BSD System Manager's Manual ZFSBOOT(8)NAME
zfsboot -- bootcode for ZFS on BIOS-based computers
DESCRIPTION
zfsboot is used on BIOS-based computers to boot from a filesystem in a ZFS pool. zfsboot is installed in two parts on a disk or a partition
used by a ZFS pool. The first part, a single-sector starter boot block, is installed at the beginning of the disk or partition. The second
part, a main boot block, is installed at a special offset within the disk or partition. Both areas are reserved by the ZFS on-disk specifi-
cation for boot use. If zfsboot is installed in a partition, then that partition should be made bootable using appropriate configuration and
boot blocks described in boot(8).
BOOTING
The zfsboot boot process is very similar to that of gptzfsboot(8). One significant difference is that zfsboot does not currently support the
GPT partitioning scheme. Thus only whole disks and MBR partitions, traditionally referred to as slices, are probed for ZFS disk labels. See
the BUGS section in gptzfsboot(8) for some limitations of the MBR scheme support.
USAGE
zfsboot supports all the same prompt and configuration file arguments as gptzfsboot(8).
FILES
/boot/zfsboot boot code binary
/boot.config parameters for the boot block (optional)
/boot/config alternative parameters for the boot block (optional)
EXAMPLES
zfsboot is typically installed using dd(1). To install zfsboot on the ada0 drive:
dd if=/boot/zfsboot of=/dev/ada0 count=1
dd if=/boot/zfsboot of=/dev/ada0 iseek=1 oseek=1024
If the drive is currently in use, the GEOM safety will prevent writes and must be disabled before running the above commands:
sysctl kern.geom.debugflags=0x10
zfsboot can also be installed in an MBR slice:
gpart create -s mbr ada0
gpart add -t freebsd ada0
gpart create -s BSD ada0s1
gpart bootcode -b /boot/boot0 ada0
gpart set -a active -i 1 ada0
dd if=/boot/zfsboot of=/dev/ada0s1 count=1
dd if=/boot/zfsboot of=/dev/ada0s1 iseek=1 oseek=1024
Note that commands to create and populate a pool are not shown in the example above.
SEE ALSO dd(1), boot.config(5), boot(8), gptzfsboot(8), loader(8), zfsloader(8), zpool(8)HISTORY
zfsboot appeared in FreeBSD 7.3.
AUTHORS
This manual page was written by Andriy Gapon <avg@FreeBSD.org>.
BUGS
Installing zfsboot with dd(1) is a hack. ZFS needs a command to properly install zfsboot onto a ZFS-controlled disk or partition.
BSD September 15, 2014 BSD
11-09-2010
