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Linux: How to Backup Hard Disk Partition Table (MBR)

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Linux: How to Backup Hard Disk Partition Table (MBR) Linux: How to backup hard disk partition table ... http://www.cyberciti.biz/tips/linux-how-to-backup-... About Forum Howtos & FAQs Low graphics Shell Scripts RSS/Feed nixcraft - insight into linux admin work Linux: How to backup hard disk partition table (MBR) by nixCraft on July 10, 2006 · 12 comments· Last updated September 3, 2007 1 of 9 03/27/2013 09:43 PM Linux: How to backup hard disk partition table ... http://www.cyberciti.biz/tips/linux-how-to-backup-... If you don't want to take any chances with your data, it is recommended that you backup hard disk partition table. Last Friday I was discussing some issues with one of our customer and he pointed out me dd command. Backup MBR with dd command dd the old good command which now backup partition tables even writes CDs ;). Backing up partition is nothing but actually backing up MBR (master boot record). The command is as follows for backing up MBR stored on /dev/sdX or /dev/hdX : # dd if=/dev/sdX of=/tmp/sda-mbr.bin bs=512 count=1 Replace X with actual device name such as /dev/sda. Now to restore partition table to disk, all you need to do is use dd command: # dd if= sda-mbr.bin of=/dev/sdX bs=1 count=64 skip=446 seek=446 dd command works with Solaris, HP-UX and all other UNIX like operating systems. Read man page of dd for more info. Tweet Like 10 You should follow me on twitter here or grab rss feed to keep track of new changes. Featured Articles: 30 Handy Bash Shell Aliases For Linux / Unix / Mac OS X Top 30 Nmap Command Examples For Sys/Network Admins 25 PHP Security Best Practices For Sys Admins 20 Linux System Monitoring Tools Every SysAdmin Should Know 20 Linux Server Hardening Security Tips Linux: 20 Iptables Examples For New SysAdmins 2 of 9 03/27/2013 09:43 PM Linux: How to backup hard disk partition table ... http://www.cyberciti.biz/tips/linux-how-to-backup-... Top 20 OpenSSH Server Best Security Practices Top 20 Nginx WebServer Best Security Practices 20 Examples: Make Sure Unix / Linux Configuration Files Are Free From Syntax Errors 15 Greatest Open Source Terminal Applications Of 2012 My 10 UNIX Command Line Mistakes Top 10 Open Source Web-Based Project Management Software Top 5 Email Client For Linux, Mac OS X, and Windows Users The Novice Guide To Buying A Linux Laptop { 12 comments… read them below or add one } 1 Wartin April 15, 2010 at 1:37 pm dd if= sda-mbr.bin it has a blank space after =, it should read dd if=sda-mbr.bin of=/dev/sdX bs=1 count=64 skip=446 seek=446 Reply 2 PT August 10, 2010 at 5:14 am This advice does not work if you have an extended partition table. Reply 3 VernDog January 26, 2011 at 4:26 pm Wrong! This method DOES WORK with extended , primary partitions. I’ve used it all the time, to both backup & restore. Just remember to backup MBR if you add any changes to partitions. Reply 4 brendan December 1, 2012 at 11:29 pm No. He’s right. The MBR lists whether a partition is active, its type, start point and number of sectors within the partition. MBR lists this for a maximum of 4 partitions. This not include logical partitions. They are described within the extended partition. They are not described in the MBR. Reply 5 Jack October 9, 2010 at 9:47 am 3 of 9 03/27/2013 09:43 PM Linux: How to backup hard disk partition table ... http://www.cyberciti.biz/tips/linux-how-to-backup-... PT, You can use sfdisk to backup extended partition table. sfdisk -d /dev/sdX > backup-sdX.sf Restore: sfdisk /dev/sdX < backup-sdX.sf Reply 6 jns August 22, 2011 at 6:07 am The restore line corrupted my entire partition table… beware, i guess… Reply 7 victor September 3, 2011 at 12:18 pm jns, it could be because only one seek is needed. there are 446b of MBR, 64b of Partition Table and 2 as end (0x55aa). {= 512b} if skip and seek aren’t synonimous, you seek 446 + 446. thus, command line must be dd if=sda-mbr.bin of=/dev/sdX bs=1 count=64 skip=446 or dd if=sda-mbr.bin of=/dev/sdX bs=1 count=64 seek=446 Reply 8 victor September 3, 2011 at 12:45 pm i’m sorry, i’m mistake. error coud be if mbr is all zero. then you must add conv=notrunc for no file optimization. ej: 2GB file dd if=/dev/zero of=afile bs=1 seek=2GB count=1 (file size in hd<1kb) or dd if=/dev/zero of=afile bs=1 count=2GB (file size in hd=2gb) size must be specific in bytes, 2gb is only for easy read. note: a little bs spend more time Reply 4 of 9 03/27/2013 09:43 PM Linux: How to backup hard disk partition table ... http://www.cyberciti.biz/tips/linux-how-to-backup-... 9 Mr_T September 13, 2011 at 7:31 pm Victor, In your first post, could you clarify the units you are using for mbr and the partiton table and what is the “2 as end” means. Its not intuitive to the uninitiated. Thanks Reply 10 brendan December 1, 2012 at 11:42 pm He’s talking about bytes. 446 bytes of Bootstrap code, then 4 partition entries x 16 bytes = 64 bytes, then 2 bytes of signature (a 16 bit number = 0101010110101010). This is 55aa in hex and 21930 in decimal. Reply 11 brendan December 1, 2012 at 11:44 pm 446 + 64 + 2 = 512 bytes :) Reply 12 Marek December 7, 2011 at 11:19 am What about GPT ? Reply Leave a Comment Name * E-mail * Website 5 of 9 03/27/2013 09:43 PM Linux: How to backup hard disk partition table ... http://www.cyberciti.biz/tips/linux-how-to-backup-... You can use these HTML tags and attributes for your code and commands: <strong> <em> <ol> <li> <u> <ul> <blockquote> <pre> <a href="" title=""> Security Question: What is 12 + 13 ? Solve the simple math so we know that you are a human and not a bot. Submit Tagged as: backup hard disk, dd command, disk partition, master boot record, mbr, partition table Previous post: May the best team win Next post: Linux Iptables block remote X Window server connection GET FREE TIPS & NEWS Make the most of Linux Sysadmin work! Enter your email Join Youtube | Twitter | Google + Loading 6 of 9 03/27/2013 09:43 PM Linux: How to backup hard disk partition table ... http://www.cyberciti.biz/tips/linux-how-to-backup-... nixCraft Like 30,870 people like nixCraft. Facebook social plugin Related Posts Restore Debian Linux Grub boot loader How do I forcefully unmount a Linux disk partition? Re-read The Partition Table Without Rebooting Linux System 7 of 9 03/27/2013 09:43 PM Linux: How to backup hard disk partition table ... http://www.cyberciti.biz/tips/linux-how-to-backup-... How Do I Make Linux / UNIX Filesystem Backup With dd? HowTo: Linux Check IDE / SATA Hard Disk Transfer Speed Linux Creating a Partition Size Larger Than 2TB Quickly Backup / dump MySql / Postgres database to another remote server securely Fix a dual boot Windows Vista and Linux problem 8 of 9 03/27/2013 09:43 PM Linux: How to backup hard disk partition table ... http://www.cyberciti.biz/tips/linux-how-to-backup-... Perl script to monitor disk space and send an email Repairing ReiserFS file system with reiserfsck ©2004-2013 nixCraft. All rights reserved. Cannot be reproduced without written permission. Privacy Policy | Terms of Service | Questions or Comments | Copyright Info | Sitemap 9 of 9 03/27/2013 09:43 PM.
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