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question on mounting my usb drive

Posted on 2004-04-20
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Last Modified: 2010-04-20
Hi,

in the past, I have been mounting my mp3 player with the following command:
mount -t auto /dev/sdb1 /mnt/usb

it works well until recently I don't know why it fail to work anymore.
It gives me the following error:
mount: /dev/sdb1 is not a valid block device

Strangely, when I tried "mount -t auto /dev/sdc1 /mnt/usb", it works.
Why is it that I can't mount on /dev/sdb1 anymore and has to mount on /dev/sdc1?
what happened to /dev/sdb1?

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Question by:help-me
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8 Comments
 
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Accepted Solution

by:
jlevie earned 200 total points
ID: 10870829
Have you attached any other USB storage devices, scanner, printers, etc., to the system recently? All of those type devices will be used as a pseudo SCSI device and they will "take over" /dev/sdb if the USB player isn't attached when the new device is added. It is also possible for a USB device to move to a different SCSI device if the "signature" of the device changes, like when a firmware update to an MP3 player is applied.
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Author Comment

by:help-me
ID: 10870848
hi,

i have not attached any new storage devices.
neither have I performed any updates to the firmware recently.

how can i check what is using /dev/sdb and also how to make it available like before?
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Expert Comment

by:gospel-preacher
ID: 10871170
I have an adsl broadband modem installed on usb - linux doesn't 'see' it!
Any suggestions?
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Author Comment

by:help-me
ID: 10871313
hi gospel-preacher,

you may want to take a look at this webpage:
http://www.tldp.org/HOWTO/DSL-HOWTO/installation.html#AEN420

you may have to install specific drivers for your modem
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LVL 44

Expert Comment

by:Karl Heinz Kremer
ID: 10872557
gospel-preacher,

if you have a question, you should create a new question. This way, a lot more people will see it and will potentially provide information. If you post your question as a comment in a question, only those people who are participating in this question will have a chance to see it.

I see that you are new to EE, you will receive 5 points per day, so after four days you will have enough points to post a 20 point question. If you need help quicker, you have the chance to either buy points, or just become a paying member.
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Expert Comment

by:tolgadalkilic
ID: 10884154
re: help-me
linux changes the usb devices randomly with respect to the other devices attached to your box. But this is not problem i guess, you can access your mp3 player with sdc1 sdd1 etc. The question is do you really need to use sdb1? I guess you dont.
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LVL 44

Expert Comment

by:Karl Heinz Kremer
ID: 10884273
These changes are actually not random: The available devices are named in a certain order. If you connect a device at a later time, it will get the next available device name.
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Expert Comment

by:tolgadalkilic
ID: 10884320
i meant this as random. Not mean that use sdj1 if sdc1 is empty! I thought you should understand. Sorry.
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