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I was kept my USB drive to the system its detecting but i not showing the drive.

Key board and mouse are working only usb stick are not working.

$ lsusb 
Bus 005 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 003 Device 003: ID 413c:2107 Dell Computer Corp. 
Bus 003 Device 002: ID 04b3:310c IBM Corp. Wheel Mouse
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 007: ID 0781:5567 SanDisk Corp. 
Bus 001 Device 006: ID 04e8:685e Samsung Electronics Co., Ltd 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

usb 6 and 7 are the external device but not visible the drive

I was mount the usb the flowing error

$ sudo fdisk -l

Disk /dev/sda: 250.1 GB, 250059350016 bytes 255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512   bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0000a321

Device   Boot        Start          End       Blocks    Id   System

/dev/sda1    *            1           29285   235226112   83  Linux

/dev/sda2              29285          30402     8970241    5  Extended

/dev/sda5              29285          30402     8970240   82  Linux swap / Solaris

$ sudo mkdir /media/external

$ sudo mount -t vfat /dev/sdb1 /media/external -o 

mount: special device /dev/sdb1 does not exist

but it is not working

share|improve this question
Try lsblk and udisksctl status , see what that says – Serg Aug 21 '14 at 6:27

Try using Disk Utility to see if that sees the drive. It could be that it has a weird partition setup or File System. If disk utility can see the drive then try to partition the drive and set a new File System depending on your requirements.

share|improve this answer
It's not visible in disk utility – murthy May 5 '14 at 10:01
sudo vim /etc/modprobe.d/blacklist 

blacklist usb-drive remove if you want to access the usb

sudo vim/etc/modprobe.d/blacklist.conf 

blacklist usb-storge make it comment

share|improve this answer
I love vi and vim, but I don't think it's a good idea to suggest this editor to the general public. Also: - You should explain how one needs to do to "comment" something in those files. - Why do suggest to remove one driver and comment the other one? – MadMike Mar 31 '15 at 6:07

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