(Please an urgent help) mount: special device dev/sdb1 does not exist

shpenat · 12-07-2009, 11:33 AM

From your dmesg output I can tell, that you reconnected your USB device several times and you used different devices:

Vendor: HP Model: Officejet 6313 Rev: 1.00

Vendor: T.sonic Model: 610 Rev: 0100

Each time you attach your mass storage (T.sonic) it is asigned to different device (sdb1, sdc1, sdd1). I am little confused by your actions since I am not familiar with CentOS. Here are some questions:

1) Do you have udev? Or what is a reason for running ./MKDEV sdb1
2) What is written in your /etc/fstab? It might help us to understand what you are actually doing.

Just to check how does your computer wok, disconnect your USB storage. Then reconnect it again and run

Code:

dmesg | tail

Look on the output and find to which device your usb was attached (e.g. sdc1). Then switch to root and run

Code:

mount /dev/xxx /media/usb -t vfat

Replace xxx with device shown in your dmesg output and /media/usb with wherever you want to mount your USB device.

To other guys: Don't get so annoyed each time anybody writes urgent, etc. It is rude but replying rudely as well does not help keeping healthy conversation.

pixellany · 12-07-2009, 11:41 AM

Quote:

Originally Posted by shpenat

To other guys: Don't get so annoyed each time anybody writes urgent, etc. It is rude but replying rudely as well does not help keeping healthy conversation.

I did not see anyone reply rudely......and it has not stopped the substantive discussion.

Posts saying things like "URGENT!!!!" are unfortunately all too common here, and the reaction is getting pretty predictable. Life goes on.....

onebuck · 12-07-2009, 01:39 PM

Hi,

Quote:

Originally Posted by shpenat

<snip>

To other guys: Don't get so annoyed each time anybody writes urgent, etc. It is rude but replying rudely as well does not help keeping healthy conversation.

I wasn't rude and find your statement to be rude! Most helpers here do aid without rudeness. But some people do need some direction. The mods do keep a good handle on things so I'm not too concerned with statements like yours.

linuxlover.chaitanya · 12-07-2009, 11:48 PM

Quote:

Originally Posted by onebuck

Hi,
. To make things cleaner therefore easier to read. You could use a pastebin for really large data/lists.

I nice tool to keep in mind. Thanks a lot.

madani · 12-08-2009, 01:47 AM

Dear shpenat ,
hi,
Much thanks to you for starting this Thread.
I did what you had recommended and now I can see my usb contents in /media/usb but I (a user) have not permission to write in it ??
May you again direct me ??
and also for making a link on desktop,I R-click on /media/usb but make link is off(inactive).

Bests,and much much thanks
madani

shpenat · 12-08-2009, 02:31 AM

You cannot erite to it because you mounted it as root hence it inherits root permissions. To be able to write to it as user you will have mount it as user. To do so you need to have proper lines in /etc/fstab. Post your /etc/fstab file here, please.

madani · 12-08-2009, 04:29 AM

Dear shpenat'

I copied /etc/fstab contents here as you said:
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

/dev/VolGroup00/LogVol00 / ext3 defaults 1 1
LABEL=/boot /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/VolGroup00/LogVol01 swap swap defaults 0 0
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

Bests
madani
.......

shpenat · 12-08-2009, 05:10 AM

Add following lines to your /etc/fstab

Code:

/dev/sdb1  /media/usb   vfat   noauto,user  0  0
/dev/sdc1  /media/usb   vfat   noauto,user  0  0
/dev/sdd1  /media/usb   vfat   noauto,user  0  0

And make sure, that /media/usb is writable by user.

This lines will allow you to mount USB manually (e.g. after plugging in your usb you will have to run

Code:

mount /media/usb

to mount it, and

Code:

umount /media/usb

before unplugging it). You can replace /media/usb with whatever directory you want your USB to mount to.

This solution will not completely solve your problem. That right-clicking stuff is probably associated with automounter (package for automatic mounting of devices). I personally have no experiences with this package (I do my mounting manually by running mount). So ask again if you want to e able to mount devices this way.

madani · 12-08-2009, 05:39 AM

I could just write in fstab as a root (not as a user).
Still my usb is writing prohibitted for users.

shpenat · 12-08-2009, 05:48 AM

If you still have it mounted as root, you need to unmount it (as root) and mount it again as user.

linuxlover.chaitanya · 12-08-2009, 05:51 AM

Usually mount command is not accessible to normal user. They do not have permissions on using the command. You can just edit the permissions on the directory where you are mounting the partition. You will have the rights to write to it then.

madani · 12-08-2009, 07:11 AM

I su to root and ran the command: umount /dev/sdd1 /media/usb -t vfat

and then, ...
please see the result:

[Nin@dhcppc0 ~]$ mount /media/usb
mount: /dev/sdb1 is not a valid block device
[Nin@dhcppc0 ~]$

2nd attempt:
[Noushin@dhcppc0 ~]$ mount /dev/sdd1 /media/usb
mount: only root can do that
[Noushin@dhcppc0 ~]$

Bests
...............................

shpenat · 12-08-2009, 08:01 AM

My appology, you will have to run

Code:

mount /dev/sdxx

, where sdxx is one of (sdb1, sdc1 sdd1) according to your current assignment. Maybe somebody else can suggest solution.

linuxlover.chaitanya · 12-09-2009, 11:39 PM

@madani,

It is saying you can not mount as normal user. And rightly so. You are logged in as normal user and not root. Your shell prompt says that.
Do you have partitions in the removable drive?