Partitions for /dev/sda are going to be like /dev/sda1, /dev/sda2, /dev/sda3, etc. You can copy them too.
The master boot record is outside of all partitions. It is the very, very first sector on the hard drive. You can copy just the boot sector like this:
A corrupt grub can't boot anything. If you can boot windows with grub, then grub is not corrupted, but maybye your partitions are, or grub.conf, and maybye you can't remember which partition number you need etc.
I'd boot the system with some sort of linux livecd to see what's going on with your partitions, and edit your grub.conf if need be.
As for how to restore a selected partition from that giant everything-backup file, I don't know. There doesn't seem to be anything like a loop device for splitting a file into partitions the way linux handles hard drives... I'll do some experimenting and see.
You can restore your boot sector easily, though, if that's the problem.
Be sure to back it up on a flash drive or something before you do that of course.
Last edited by Corona688; 08-19-2006 at 03:24 AM..
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)
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)
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)
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)
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)
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)
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)
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)
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)
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
LEARN ABOUT REDHAT
wipefs
WIPEFS(8) System Administration WIPEFS(8)NAME
wipefs - wipe a signature from a device
SYNOPSIS
wipefs [options] device...
wipefs [--backup] -o offset device...
wipefs [--backup] -a device...
DESCRIPTION
wipefs can erase filesystem, raid or partition-table signatures (magic strings) from the specified device to make the signatures invisible
for libblkid. wipefs does not erase the filesystem itself nor any other data from the device.
When used without any options, wipefs lists all visible filesystems and the offsets of their basic signatures. The default output is sub-
ject to change. So whenever possible, you should avoid using default outputs in your scripts. Always explicitly define expected columns
by using --output columns-list in environments where a stable output is required.
wipefs calls the BLKRRPART ioctl when it has erased a partition-table signature to inform the kernel about the change.
Note that some filesystems and some partition tables store more magic strings on the device (e.g. FAT, ZFS, GPT). The wipefs command
(since v2.31) lists all the offset where a magic strings have been detected.
When option -a is used, all magic strings that are visible for libblkid are erased. In this case the wipefs scans the device again after
each modification (erase) until no magic string is found.
Note that by default wipefs does not erase nested partition tables on non-whole disk devices. For this the option --force is required.
OPTIONS -a, --all
Erase all available signatures. The set of erased signatures can be restricted with the -t option.
-b, --backup
Create a signature backup to the file $HOME/wipefs-<devname>-<offset>.bak. For more details see the EXAMPLES section.
-f, --force
Force erasure, even if the filesystem is mounted. This is required in order to erase a partition-table signature on a block device.
-h, --help
Display help text and exit.
-J, --json
Use JSON output format.
-n, --noheadings
Do not print a header line.
-O, --output list
Specify which output columns to print. Use --help to get a list of all supported columns.
-n, --no-act
Causes everything to be done except for the write() call.
-o, --offset offset
Specify the location (in bytes) of the signature which should be erased from the device. The offset number may include a "0x" pre-
fix; then the number will be interpreted as a hex value. It is possible to specify multiple -o options.
The offset argument may be followed by the multiplicative suffixes KiB (=1024), MiB (=1024*1024), and so on for GiB, TiB, PiB, EiB,
ZiB and YiB (the "iB" is optional, e.g. "K" has the same meaning as "KiB"), or the suffixes KB (=1000), MB (=1000*1000), and so on
for GB, TB, PB, EB, ZB and YB.
-p, --parsable
Print out in parsable instead of printable format. Encode all potentially unsafe characters of a string to the corresponding hex
value prefixed by 'x'.
-q, --quiet
Suppress any messages after a successful signature wipe.
-t, --types list
Limit the set of printed or erased signatures. More than one type may be specified in a comma-separated list. The list or individ-
ual types can be prefixed with 'no' to specify the types on which no action should be taken. For more details see mount(8).
-V, --version
Display version information and exit.
EXAMPLES
wipefs /dev/sda*
Prints information about sda and all partitions on sda.
wipefs --all --backup /dev/sdb
Erases all signatures from the device /dev/sdb and creates a signature backup file ~/wipefs-sdb-<offset>.bak for each signature.
dd if=~/wipefs-sdb-0x00000438.bak of=/dev/sdb seek=$((0x00000438)) bs=1 conv=notrunc
Restores an ext2 signature from the backup file ~/wipefs-sdb-0x00000438.bak.
AUTHOR
Karel Zak <kzak@redhat.com>
ENVIRONMENT
LIBBLKID_DEBUG=all
enables libblkid debug output.
SEE ALSO blkid(8), findfs(8)AVAILABILITY
The wipefs command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.
util-linux December 2014 WIPEFS(8)