一.先查看对应分区：

sudo fdisk -l

Disk /dev/sda: 120.0 GB, 120034123776 bytes 255 heads, 63 sectors/track, 14593 cylinders, total 234441648 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0004bbac

   Device Boot      Start         End      Blocks   Id  System /dev/sda1   *        2048   217683967   108840960   83  Linux /dev/sda2       217686014   234440703     8377345    5  Extended /dev/sda5       217686016   234440703     8377344   82  Linux swap / Solaris

Disk /dev/sdb: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk ident