求助：u盘硬盘插入后无法自动挂载，ubuntu12.04

[smswt]

插入u盘后，没反应
终端lsusb结果如下

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 003: ID 04f2:b033 Chicony Electronics Co., Ltd
Bus 005 Device 002: ID 08ff:1600 AuthenTec, Inc. AES1600
Bus 007 Device 002: ID 046d:c01f Logitech, Inc.
Bus 002 Device 012: ID 0951:1642 Kingston Technology

最后一个是u盘
然后fdisk -l,没反应，加sudo
Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders, total 625142448 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: 0x000ce2a4

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 620949503 310473728 83 Linux
/dev/sda2 620951550 625141759 2095105 5 Extended
/dev/sda5 620951552 625141759 2095104 82 Linux swap / Solaris

结果中间没有sdb之类的东西，这三个都是系统的硬盘
现在都不知道怎么手动挂载了
找了好多方法都没用啊？？？

[lyhic]

代码： 全选

cat /proc/partitions

可以看到有sdb吗

[eexpress]

udev难道没起作用？
dmesg多看看。是不是出错了。

[冰河纣克]

ls /dev/sd* 看看有无其他磁盘存在