第一步，取得一个centos6.x的iso镜像，假设我当前的ios镜像在/iso/CentOS-6.6-x86_64-bin-DVD1.iso
第二步，插入u盘并查看u盘在当前系统下的代号
# fdisk -l
Disk identifier: 0x273e7463
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 4418 4524032 17 Hidden HPFS/NTFS
Disk /dev/sdb1: 4467 MB, 4467982336 bytes
64 heads, 32 sectors/track, 4261 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x273e7463
Device Boot Start End Blocks Id System
/dev/sdb1p1 * 1 4418 4524032 17 Hidden HPFS/NTFS
第三步，卸载u盘，
# umount /dev/sdb1
第四步，使用dd命令
# dd if=/iso/CentOS-6.6-x86_64-bin-DVD1.iso of=/dev/sdb
(记住这里of是输出设备，应该是/dev/sdb而不是/dev/sdb1)
第五步，制作成功之后出现如下画面
注：dd命令运行后不显示复制状态，要查看复制状态可以再打开一个终端，输入“while killall -USR1 dd; do sleep 5; done”查看复制状态。
# while killall -USR1 dd; do sleep 5;done
5216736+0 records out
2670968832 bytes (2.7 GB) copied, 391.29 s, 6.8 MB/s
5317833+0 records in
5317833+0 records out
2722730496 bytes (2.7 GB) copied, 396.297 s, 6.9 MB/s
5418209+0 records in
5418208+0 records out
2774122496 bytes (2.8 GB) copied, 401.319 s, 6.9 MB/s
5519217+0 records in
5519217+0 records out
2825839104 bytes (2.8 GB) copied, 406.326 s, 7.0 MB/s
5618913+0 records in
5618912+0 records out
2876882944 bytes (2.9 GB) copied, 411.356 s, 7.0 MB/s
5619585+0 records in
5619585+0 records out
2877227520 bytes (2.9 GB) copied, 416.413 s, 6.9 MB/s
5619961+0 records in
5619961+0 records out
2877420032 bytes (2.9 GB) copied, 421.431 s, 6.8 MB/s
5673785+0 records in
5673785+0 records out
2904977920 bytes (2.9 GB) copied, 426.377 s, 6.8 MB/s
Linux运维的自我修养-ywliyq
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