使用cp命令即可，# cp /dev/sr0 /data/centos6.iso 生成的鏡像iso可以用來引導系統的

查看內容iso內文件 # mount -t iso9660 /data/centos6.iso /mnt/iso

也可以使用# dd if=/dev/sr0 of=/data/centos6.iso 來生成iso鏡像，同樣可以用來引導系統

針對centos6 中將iso鏡像分成兩個，為了方便以後使用yum源時不缺包，可以將兩個iso鏡像合並

1.創建文件夾 mkdir /data/iso

2.將鏡像中的所有文件拷貝至該目錄下，對於相同的文件覆蓋即可

3.使用mkisofs 來創建合集的iso鏡像文件

#mkisofs -r -o centos6.iso /data/iso

註意:使用mkisofs創建的合集iso鏡像不能用來引導系統，只可作為yum源使用

若想要創建可以引導的合集iso鏡像文件，可以使用mkdvdiso 來創建

http://wiki.centos.org 在該網站中搜索mkdvdiso ，mkdvdiso是用來創建引導iso鏡像的shell腳本

給出準確網址:https://wiki.centos.org/zh/TipsAndTricks/DtoDVDMedia?highlight=%28mkdvdiso%29

mkdvdiso 腳本:

#!/bin/bash

# by Chris Kloiber <[email protected]>

# Mods under CentOS by Phil Schaffner <[email protected]>

# A quick hack that will create a bootable DVD iso of a Red Hat Linux

# Distribution. Feed it either a directory containing the downloaded

# iso files of a distribution, or point it at a directory containing

# the "RedHat", "isolinux", and "images" directories.

# This version only works with "isolinux" based Red Hat Linux versions.

# Lots of disk space required to work, 3X the distribution size at least.

# GPL version 2 applies. No warranties, yadda, yadda. Have fun.

# Modified to add sanity checks and fix CentOS4 syntax errors

# TODO:

# Add checks for available disk space on devices holding output and

# temp files.

# Add optional 3rd parameter to specify location of temp directory.

# Create .discinfo if not present.

OS_VER=\

$((test -e /etc/fedora-release && rpm -qf /etc/fedora-release --qf "FC%{VERSION}") \

|| (test -e /etc/redhat-release && rpm -qf /etc/redhat-release --qf "EL%{VERSION}") \

|| echo OS_unknown)

case "$OS_VER" in

EL[45]*|FC?)

IMPLANT=/usr/lib/anaconda-runtime/implantisomd5

if [ ! -f $IMPLANT ]; then

echo "Error: $IMPLANT Not Found!"

echo "Please install anaconda-runtime and try again."

exit 1

fi

;;

EL6*|FC1?)

IMPLANT=/usr/bin/implantisomd5

if [ ! -f $IMPLANT ]; then

echo "Error: $IMPLANT Not Found!"

echo "Please install isomd5sum and try again."

exit 1

fi

;;

OS_unknown)

echo "Unknown OS."

exit 1

;;

*)

echo "Fix this script for $OS_VER"

exit 1

esac

if [ $# -lt 2 ]; then

echo "Usage: `basename $0` source /destination/DVD.iso"

echo ""

echo " The 'source' can be either a directory containing a single"

echo " set of isos, or an exploded tree like an ftp site."

exit 1

fi

DVD_DIR=`dirname $2`

DVD_FILE=`basename $2`

echo "DVD directory is $DVD_DIR"

echo "ISO file is $DVD_FILE"

if [ "$DVD_DIR" = "." ]; then

echo "Destinaton Directory $DVD_DIR does not exist"

exit 1

else

if [ ! -d "/$DVD_DIR" ]; then

echo "Destinaton Directory $DVD_DIR must be an absolute path"

exit 1

else

if [ "$DVD_FILE" = "" ] || [ -d "$DVD_DIR/$DVD_FILE" ]; then

echo "Null ISO file name."

exit 1

fi

fi

fi

which mkisofs >&/dev/null

if [ "$?" != 0 ]; then

echo "mkisofs Not Found"

echo "yum install mkisofs"

fi

which createrepo >&/dev/null

if [ "$?" != 0 ]; then

echo "createrepo Not Found"

echo "yum install createrepo"

fi

if [ -f $2 ]; then

echo "DVD ISO destination $2 already exists. Remove first to recreate."

exit 1

fi

# Make sure there is enough free space to hold the DVD image on the filesystem

# where the home directory resides, otherwise change ~/mkrhdvd to point to

# a filesystem with sufficient free space.

cleanup() {

[ ${LOOP:=/tmp/loop} = "/" ] && echo "LOOP mount point = \/, dying!" && exit

[ -d $LOOP ] && rm -rf $LOOP

[ ${DVD:=~/mkrhdvd} = "/" ] && echo "DVD data location is \/, dying!" && exit

[ -d $DVD ] && rm -rf $DVD

}

cleanup

mkdir -p $LOOP

mkdir -p $DVD

ls $1/*.iso &>/dev/null

if [ "$?" = 0 ]; then

echo "Found ISO CD images..."

CDS=`expr 0`

DISKS="1"

[ -w / ] || { # Very portable, but perhaps not perfect, test for superuser.

echo "Only 'root' may use this script for loopback mounts" 1>&2

exit 1

}

for f in `ls $1/*.iso`; do

mount -o loop $f $LOOP

cp -av $LOOP/* $DVD

if [ -f $LOOP/.discinfo ]; then

cp -av $LOOP/.discinfo $DVD

CDS=`expr $CDS + 1`

if [ $CDS != 1 ] ; then

DISKS=`echo ${DISKS},${CDS}`

fi

fi

umount $LOOP

done

else

if [ -f $1/isolinux/isolinux.bin ]; then

echo "Found FTP-like tree..."

if [ -e $1/.discinfo ]; then

cp -av $1/.discinfo $DVD

else

# How does one construct a legal .discinfo file if none is found?

echo "Error: No .discinfo file found in $1"

cleanup

exit 1

fi

cp -av $1/* $DVD

else

echo "Error: No CD images nor FTP-like tree found in $1"

cleanup

exit 1

fi

fi

if [ -e $DVD/.discinfo ]; then

awk '{ if ( NR == 4 ) { print disks } else { print ; } }' disks="ALL" $DVD/.discinfo > $DVD/.discinfo.new

mv $DVD/.discinfo.new $DVD/.discinfo

else

echo "Error: No .discinfo file found in $DVD"

cleanup

exit 1

fi

rm -rf $DVD/isolinux/boot.cat

find $DVD -name TRANS.TBL | xargs rm -f

cd $DVD

createrepo -g repodata/comps.xml ./

mkisofs -J -R -v -T -o $2 -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 8 -boot-info-table $DVD

if [ "$?" = 0 ]; then

echo ""

echo "Image complete, create md5sum..."

# $IMPLANT --force $2

# Don't like forced mediacheck? Try this instead.

$IMPLANT --supported-iso --force $2

echo "Start cleanup..."

cleanup

echo ""

echo "Process Complete!"

echo "Wrote DVD ISO image to $DVD_DIR/$DVD_FILE"

echo ""

else

echo "ERROR: Image creation failed, start cleanup..."

cleanup

echo ""

echo "Failed to create ISO image $DVD_DIR/$DVD_FILE"

echo ""

fi

使用方法: # mkdvdiso.sh source /destination/DVD.iso

順便想起來點東西:在linux系統中拷貝文件至USB設備中時，在cp命令執行完成以後記住要執行幾次sync命令。

因為拷貝的過程分程是: 磁盤 --> 內存的cache區域 --> 內存的buffer區域 --> 系統會找個合適的時機將內容再拷貝至USB,所以可以執行幾次sync 來將buffer中的數據寫入USB

其實在/etc/fstab配置文件中,系統為了提高效率，默認的defaults中的選項不就是async的嗎(man 5 fstab 配置文件幫助！你值得擁有)

創建鏡像iso文件