命令行（dd）：清空磁盘分区表
这个操作会破坏数据，所以操作前需要确认你要执行的清空操作是正确且必要的。
具体的操作是通过命令“dd”实现的。
命令：dd if=/dev/zero of=/dev/sdb bs=1M count=512
具体如下：
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[root@rhel5-server lab]# dd if=/dev/zero of=/dev/sdb [root@rhel5-server lab]# [root@rhel5-server lab]# ll /dev/sd* brw-r----- 1 root disk 8, 0 Feb 13 19:55 /dev/sda brw-r----- 1 root disk 8, 1 Feb 13 19:55 /dev/sda1 brw-r----- 1 root disk 8, 2 Feb 13 19:55 /dev/sda2 brw-r----- 1 root disk 8, 3 Feb 13 19:55 /dev/sda3 brw-r----- 1 root disk 8, 16 Feb 14 01:19 /dev/sdb [root@rhel5-server lab]# [root@rhel5-server lab]# fdisk -l /dev/sdb Disk /dev/sdb: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System [root@rhel5-server lab]# [root@rhel5-server lab]# dd if=/dev/zero of=/dev/sdb bs=1M count=512 512+0 records in 512+0 records out 536870912 bytes (537 MB) copied, 1.71457 seconds, 313 MB/s [root@rhel5-server lab]# [root@rhel5-server lab]# fdisk -l /dev/sdb Disk /dev/sdb: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk /dev/sdb doesn't contain a valid partition table [root@rhel5-server lab]# |
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Done。
