帮忙看一下，我有两块硬盘，目前用df -lha只能看到第一块

[linrenling]

帮忙看一下，我有两块硬盘，目前用df -lha只能看到第一块，硬盘，后面那块硬盘怎么加载进去，然后可以给文件系统使用？
[root@cl-t130-382cl ~]# fdisk -l

Disk /dev/sda: 320.0 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 274 2096482+ 83 Linux
/dev/sda3 275 535 2096482+ 82 Linux swap / Solaris
/dev/sda4 536 38913 308271285 5 Extended
/dev/sda5 536 38913 308271253+ 83 Linux

Disk /dev/sdb: 320.0 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 13 104391 83 Linux
/dev/sdb2 14 274 2096482+ 83 Linux
/dev/sdb3 275 535 2096482+ 82 Linux swap / Solaris
/dev/sdb4 536 38913 308271285 5 Extended
/dev/sdb5 536 38913 308271253+ 83 Linux

[linrenling]

[root@cl-t130-382cl ~]# mount /dev/sdb /home/www/comics
mount: you must specify the filesystem type