再次查看空间，可以看到free的空间变成了linux的文件格式。
设备号 sda4，没有文件系统。
四、格式化新分配的空间。
[root@ root]# id
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
[root@ root]# mkfs -t ext3 /dev/sda4
mke2fs 1.32 (09-Nov-2002)
warning: 334 blocks unused.
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
2626560 inodes, 5242880 blocks
262160 blocks (5.00%) reserved for the super user
First data block=0
160 block groups
32768 blocks per group, 32768 fragments per group
16416 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 20 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.