Sponsored Content
Operating Systems Linux Gentoo How to copy single partition? Post 302085962 by Corona688 on Monday 21st of August 2006 11:05:26 AM
Old 08-21-2006
Quote:
Originally Posted by siegfried
Yes -- my backup is a triple *bootable* drive (thank goodness -- I can verify that everything still works).

So you gave me several dd commands but not one that would copy an entire partition from one disk to another. Could you give me an example of that?
You don't need special commands, the ones you already have will work quite fine. Linux gives you special files for partitions that you can use the same way you use the special files it gives you for disks. I'd always use dd instead of cp for copying whole drives or partitions but GNU cp is apparently smart enough to handle nearly anything.

For the record, copying from disk A partition 1 to disk B partition 1:
Code:
dd if=/dev/sda1 of=/dev/sdb1 conv=noerror,sync
# I'd reccomend dd over cp, dd can be told to not die on bad sectors as in above
# cp /dev/sda1 /dev/sdb1

The "conv=noerror,sync" is something important that cp does not have as far as I know... in the case of error, it will skip that sector in the input and write a sector full of zeroes on the output. cp would probably just stop on any errors.
Quote:
So if I'm getting a grub prompt but grub cannot find the grub.conf file (which I believe is in a linux partition) that could indicate the linux partition is corrupted.
That's what I'd think.
Quote:
I wonder if grub could do a dd for me? hmmm... if not, then knoppix probably could.
knoppix could, yes. Though a full-on graphical interface is probably overkill. Smilie I prefer Gentoo liveCDs, or those old little Redhat sysadm disks.
Quote:
Let's suppose I book with knoppix. Would fdisk -l enumerate my drives?
...apparently it does. I did not know that. Smilie
Quote:
I don't understand the dd command for copying a boot sector. Where is the destination and source specified?
The input file is specified with the "if=something", and the output file is specified with "of=something". If they are not given, they are assumed to be standard input and standard output. the "bs=512" tells it to assume 512 bytes per sector. The count=1 tells it to copy one and ONLY one sector. So, it copies the first and ONLY the first sector from the hard drive to file. tadah! Smilie
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to copy data into a single file plus title

Hi Can anyone help me with the task below? Example: The contents in fileA.txt are: HELLO HOW DO U DO? The contents in fileA.txt are: HI I AM FINE. how to combine the data in 2 files into one with the format below? Case A-fileA.txt HELLO HOW DO U DO? Case B-fileB.txt (4 Replies)
Discussion started by: c0384
4 Replies

2. UNIX for Dummies Questions & Answers

Copy single file to multiple directories

Please help - I need to copy a single file to multiple directories. Dir structure: Parent_Directoy Filename1 Child_Directory1 Child_Directory2 Child_Directory3 Child_Directory4 .... So I need to copy Filename1 to all of the... (2 Replies)
Discussion started by: kthatch
2 Replies

3. Slackware

Install more than one OS in a single partition...

Hello dear........this is karan singh. I want to ask a question that how can we install more than one OS in a single partition of any hard disk. I am not asking about to install more than one os in a hard disk,but on a single partition. NOTE:I am confident that it is possible to install... (2 Replies)
Discussion started by: Alohamora
2 Replies

4. UNIX for Advanced & Expert Users

copy a whole partition excluding specified.

Scenario: I would want to copy my / to /mnt, and to avoid recursion exclude /mnt. cp -avx / /mnt If i use the above i believe it would run recursively, and end up in mess. So how to do it ?! Basically this / is sda1, and /mnt is sda2 and sda1 is where only OS is available & currently... (2 Replies)
Discussion started by: thegeek
2 Replies

5. Shell Programming and Scripting

Enhanced partition copy script (new & improved!)

This is now a larger script than I would customarily post. But many folks have become accustom to getting it off this forum. Every couple of years I update my favorite scripts. This script is one that I use regularly and have posted older versions every couple of years. I noticed that it has... (3 Replies)
Discussion started by: jwzumwalt
3 Replies

6. Filesystems, Disks and Memory

Using dd to copy a partition.

Here's a conundrum. I use a ThinkPad (T30) which has a slot on the side for the hard drive. It is very easy to swap this with another hard drive which I keep as a backup. Now when I copy the Linux partition from my (in use) hard drive to the backup one (in my UltraBay slot) it takes only 30... (0 Replies)
Discussion started by: newyorkpaulie
0 Replies

7. Red Hat

Single command to Partition and label as LVM whole disk

Hello, someone please suggest me how write a script or command to create partition and label whole disk as LVM . I have multiple servers that I to label as LVM using fdisk, that will very hard process. This is what I currently doing to create to partition and label. # fdisk /dev/sdb ... (0 Replies)
Discussion started by: bobby320
0 Replies

8. Shell Programming and Scripting

revision of copy script to allow for single quote

I have the following script that I use to copy a list of files from one dir to another, #!/usr/bin/bash # $1=filename of file with the list of files to copy # $2=column header for col in list file with filenames (filePath in most cases) # $3=src dir # $3=destination dir FILE_LIST="$1"... (6 Replies)
Discussion started by: LMHmedchem
6 Replies

9. Shell Programming and Scripting

Copy files recursively to one single directory

I need to copy a complete directory structure into a new location. But I want to have all files copied into one directory and leave out the directory structure. So all files must be placed in one directory. (4 Replies)
Discussion started by: ReneVL
4 Replies

10. Solaris

More > 1 TB single file cant copy

good evening, hi, I have problem for copy file, size more > 1 TB, just only for single file. error said, capacity not enough, even my storage I set to 4 TB, file always reject during finish copy. but, if I copy with multiple file/separate file, total calculation file is 2 TB, always success.... (10 Replies)
Discussion started by: katumping
10 Replies
All times are GMT -4. The time now is 04:55 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy