how to detect USB devices like MP3 players

jmorgan324 · 07-23-2007, 03:42 PM

I'm trying to connect my sansa e250 to my computer but I don't know where to find it in the options.

if someone could help me I would appreciate it a lot

pljvaldez · 07-23-2007, 03:47 PM

Usually it will get mounted automatically under a certain directory. What distribution (Suse, ubuntu, pclinux os, etc) are you using? And what desktop (KDE, gnome, xfce, etc)? That'll help a bit more.

jmorgan324 · 07-23-2007, 03:51 PM

i am using ubuntu and gnome for a desktop

pljvaldez · 07-23-2007, 04:15 PM

I think in Gnome, you use Nautilis. The device should get mounted someplace like /media/sda1 or the like.

jmorgan324 · 07-23-2007, 04:22 PM

i went to computer and then i went to file system all i see in media is cdrom and cdrom0

saikee · 07-23-2007, 04:30 PM

In Ubuntu terminal type

Code:

sudo su
fdisk -l

Repeat the command until it shows up.

To mount it manually, assuming sda1 is needed

Code:

mkdir /media/sda1
mount /dev/sda1 /media/sda1
ls /mnt/sda1

jmorgan324 · 07-23-2007, 04:40 PM

i tried to mount it but when the sda1 folder comes up in media i clicked it and it just brought me back to the file system menu

oskar · 07-23-2007, 04:47 PM

you can see if it is being recognized when you connect it with:

Code:

$ lshal -h

and see where the kernel put it with:

Code:

$ dmesg | tail -n 20

The tail part just shows you the last 20 lines which is all you need.
If it doesn't get mounted automatically, you can mount it with

Code:

$ pmount [device]

Which is nicer, because it doesn't give you any trouble with permissions... It get's mounted in /media/'device-name'.

oskar · 07-23-2007, 04:49 PM

Quote:

Originally Posted by jmorgan324

i tried to mount it but when the sda1 folder comes up in media i clicked it and it just brought me back to the file system menu

Because in your case sda1 is obviously the root file system. That's why you should check dmesg or look for it in "$ fdisk -l"
btw... you usually don't have to be root to see removable devices with "fdisk -l"... and you certainly don't have to become root permanently "sudo su"... As root there are so many ways to do permanent damage just with typos.

saikee · 07-23-2007, 04:49 PM

I have left in Post #6 this line

Code:

ls /mnt/sda1

It is supposed to show you the inside of sda1 to make sure you have mounted the right partition. Well was it the right one?

If Ubuntu disallows you to see it then you don't have owner permission to access the files. To change it you need to type this line in the "root" terminal

Code:

chown -R your_username /mnt/sda1/*

where your_username is you logged on username

jmorgan324 · 07-23-2007, 04:52 PM

this is what it shows me:

josh@josh-laptop:~$ dmesg | tail -n 20
[ 83.188000] Using specific hotkey driver
[ 83.240000] pcc_acpi: loading...
[ 87.020000] [drm] Initialized drm 1.1.0 20060810
[ 87.020000] ACPI: PCI Interrupt 0000:00:02.0[A] -> GSI 16 (level, low) -> IRQ 17
[ 87.020000] [drm] Initialized i915 1.6.0 20060119 on minor 0
[ 87.504000] ppdev: user-space parallel port driver
[ 88.360000] apm: BIOS not found.
[ 88.492000] Bluetooth: Core ver 2.11
[ 88.492000] NET: Registered protocol family 31
[ 88.492000] Bluetooth: HCI device and connection manager initialized
[ 88.492000] Bluetooth: HCI socket layer initialized
[ 88.512000] Bluetooth: L2CAP ver 2.8
[ 88.512000] Bluetooth: L2CAP socket layer initialized
[ 88.684000] Bluetooth: RFCOMM socket layer initialized
[ 88.684000] Bluetooth: RFCOMM TTY layer initialized
[ 88.684000] Bluetooth: RFCOMM ver 1.8
[ 199.828000] ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[ 215.644000] eth1: no IPv6 routers present
[ 3968.696000] usb 5-3: new high speed USB device using ehci_hcd and address 2
[ 3970.028000] usb 5-3: configuration #128 chosen from 1 choice

where does it tell me the device is

oskar · 07-23-2007, 05:01 PM

wait 15 seconds and try again... (you did this right after you connected, right? ) This should show up almost instantly though.
If not, post the output of "fdisk -l" and "sudo fdisk - l" if the first one returned nothing.

jmorgan324 · 07-23-2007, 05:05 PM

well now it tells me this:

josh@josh-laptop:~$ dmesg | tail -n 20
[ 87.020000] ACPI: PCI Interrupt 0000:00:02.0[A] -> GSI 16 (level, low) -> IRQ 17
[ 87.020000] [drm] Initialized i915 1.6.0 20060119 on minor 0
[ 87.504000] ppdev: user-space parallel port driver
[ 88.360000] apm: BIOS not found.
[ 88.492000] Bluetooth: Core ver 2.11
[ 88.492000] NET: Registered protocol family 31
[ 88.492000] Bluetooth: HCI device and connection manager initialized
[ 88.492000] Bluetooth: HCI socket layer initialized
[ 88.512000] Bluetooth: L2CAP ver 2.8
[ 88.512000] Bluetooth: L2CAP socket layer initialized
[ 88.684000] Bluetooth: RFCOMM socket layer initialized
[ 88.684000] Bluetooth: RFCOMM TTY layer initialized
[ 88.684000] Bluetooth: RFCOMM ver 1.8
[ 199.828000] ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[ 215.644000] eth1: no IPv6 routers present
[ 3968.696000] usb 5-3: new high speed USB device using ehci_hcd and address 2
[ 3970.028000] usb 5-3: configuration #128 chosen from 1 choice
[10017.300000] usb 5-3: USB disconnect, address 2
[10043.908000] usb 5-3: new high speed USB device using ehci_hcd and address 3
[10044.916000] usb 5-3: configuration #128 chosen from 1 choice

oskar · 07-23-2007, 05:27 PM

hmmm...
What it should say is "blah blah attached removeable device [dev] blah blah"
But it doesn't...
Well... check fdisk. this is odd though.

Quote:

Originally Posted by saikee

I have left in Post #6 this line

Code:

ls /mnt/sda1

It is supposed to show you the inside of sda1 to make sure you have mounted the right partition. Well was it the right one?

If Ubuntu disallows you to see it then you don't have owner permission to access the files. To change it you need to type this line in the "root" terminal

Code:

chown -R your_username /mnt/sda1/*

where your_username is you logged on username

... can't you just change the ownership of the mountpoint? I have nothing to try this now, but wouldn't

Code:

$ sudo chown user:group [mountopoint]

do it?

Another way to do this would be by mounting it directly with user permissions... If pmount doesn't work... Well I'll get to that IF pmount doesn't work

oskar · 07-23-2007, 05:43 PM

found this http://www.mail-archive.com/linux-us.../msg17595.html
Apparently the problem is that the mp3 player is in MTB-mode, and you have to switch it to MSC-mode -- looks like you have to adjust that on the player.

Quote:

I had
forgotten I connected it to a Windows machine which forces it to use MTP
mode versus MSC mode. All that and a bag of chips, plus FUN.

The Sansa e250 is auto-mounting perfectly since I changed the setting.