[ubuntu-uk] card reader not recognised

[Ian Pascoe]

Afternoon Norman

I honestly think, from experience not from a technical standpoint, that  any
storage device attached through a hub is likely to perform intermittently at
best.  This is, as I have been told by those who know more than I, due to a
combination of the hub not correctly filtering the datastreams, and an
inadequacy in the USB 2.0 protocol.  I have rarely managed to successfully
attach storage devices other than directly to a PC mount ie not through a
hub.

Other devices like keyboards, mice, webcams etc seem to behave as expected.

Perhaps, if sockets permit, try putting the card reader directly into one of
your PC mounted sockets and run the keyboard and mouse through the hub.

Ian

-----Original Message-----
From: ubuntu-uk-bounces at lists.ubuntu.com
[mailto:ubuntu-uk-bounces at lists.ubuntu.com]On Behalf Of Norman
Silverstone
Sent: 22 July 2009 16:55
To: ubuntu-uk at lists.ubuntu.com
Subject: Re: [ubuntu-uk] card reader not recognised


< snip >

> Jul 22 14:20:46 digital-darkroom kernel: [ 5604.633232] sd 7:0:0:0:
> [sdc] READ CAPACITY failed
> Jul 22 14:20:46 digital-darkroom kernel: [ 5604.633235] sd 7:0:0:0:
> [sdc] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK,SUGGEST_OK
>
> to me suggests that you might want to run dosfsck on the card being
> used. Notice it's talking about sdc and not the card reader directly,
> that indicates it's talking about the card. Plug the thing in with the
> card in, wait until it mounts, then unmount it (click on the icon on the
> desktop and eject or in a terminal use sudo umount /dev/sdc) then in a
> terminal run sudo dosfsck /dev/sdc1 .

Here is the reponse:-

norman at digital-darkroom:~$ sudo dosfsck /dev/sdc1
dosfsck 3.0.1, 23 Nov 2008, FAT32, LFN
open /dev/sdc1:No such file or directory
norman at digital-darkroom:~$
>
> If this does not give a response then it's some interaction between the
> driver for the card reader and the card reader, and without knowing the
> make/model of the card reader (a pastebin of the output from lsusb will
> tell us this) I don't think I can be of much more use. Sorry.

Bus 001 Device 053: ID 058f:6366 Alcor Micro Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
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 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
norman at digital-darkroom:~$

I hope this helps.

Norman



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