linux dd命令刻录启动U盘详解

dd if=xxx.iso of=/dev/sdb bs=1M

用以上命令前必须卸载u盘,sdb是你的u盘,bs=1M是块的大小,后面的数值大,写的速度相对块一点,但也不是无限的,我一般选2M,注意,执行命令后很块完成,但u盘还在闪,等不闪了,安全移除。

[root@ok Desktop]# fdisk -l

Disk /dev/sda: 500.1 GB,  bytes
 heads,  sectors/track,  cylinders
Units = cylinders of  *  =  bytes
Sector size (logical/physical):  bytes /  bytes
I/O size (minimum/optimal):  bytes /  bytes
Disk identifier: 0x000dcf9e

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *                                Linux
Partition  does not end on cylinder boundary.
/dev/sda2                           8e  Linux LVM

Disk /dev/mapper/vg_ok-lv_root: 53.7 GB,  bytes
 heads,  sectors/track,  cylinders
Units = cylinders of  *  =  bytes
Sector size (logical/physical):  bytes /  bytes
I/O size (minimum/optimal):  bytes /  bytes
Disk identifier: 0x00000000

Disk /dev/mapper/vg_ok-lv_swap:  MB,  bytes
 heads,  sectors/track,  cylinders
Units = cylinders of  *  =  bytes
Sector size (logical/physical):  bytes /  bytes
I/O size (minimum/optimal):  bytes /  bytes
Disk identifier: 0x00000000

Disk /dev/sdd: 15.5 GB,  bytes #这是Ｕ盘
 heads,  sectors/track,  cylinders
Units = cylinders of  *  =  bytes
Sector size (logical/physical):  bytes /  bytes
I/O size (minimum/optimal):  bytes /  bytes
Disk identifier: 0x39768880

   Device Boot      Start         End      Blocks   Id  System
/dev/sdd1   *                             Hidden HPFS/NTFS

Disk /dev/mapper/vg_ok-lv_home: 442.1 GB,  bytes
 heads,  sectors/track,  cylinders
Units = cylinders of  *  =  bytes
Sector size (logical/physical):  bytes /  bytes
I/O size (minimum/optimal):  bytes /  bytes
Disk identifier: 0x00000000

[root@ok Desktop]# /bin/dd if=/home/ISO/CentOS--x86_64-Minimal-.iso of=/dev/sdb

上面的这命令注意是/dev/sdb 不是/dev/sdb1