Re: [SLE] USB / Hotplug news?

From: Steve King (stevenking66_at_yahoo.co.uk)
Date: 09/05/04

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    To: suse-linux-e@suse.com
Date: Sat, 4 Sep 2004 23:26:59 +0100

    Hi

    This is a follow-up to my previous postings re problems mounting a couple of
    USB devices on Suse 9.1: an MP3 player / memory stick and a camera. I've done
    some more digging around and have found some interesting things out about the
    MP3 player. According to Suse 9.0, the MP3 "disk" is partitioned as follows:

    /dev/sda 61.9MB 0 1006
    /dev/sda1 60.4MB 0 982

    The sda1 partition is reported to be FAT12. I have read that the 2.6 kernel
    has improved support for FAT12, but I cannot help wondering whether this is
    the problem? Mind you, as the camera is FAT16, this is probably a red
    herring.

    Also odd is that the MP3 player is supposedly 65MB (so the messages say when I
    plugged it in) - I presume the extra 4 or 5 MB is where the MP3 player
    software sits. But does linux 2.6 realise that? There are interesting
    messages when the device is plugged in:

    linux /etc/hotplug/usb.agent[6816]: need a device for this command
    linux kernel: usb 1-1: new full speed USB device using address 3
    linux kernel: usb 1-1: Product: NOMAD MuVo
    linux kernel: usb 1-1: Manufacturer: Creative Tech
    linux kernel: usb 1-1: SerialNumber: 000000000000
    linux kernel: scsi1 : SCSI emulation for USB Mass Storage devices
    linux kernel: Vendor: CREATIVE Model: NOMAD_MUVO Rev: 0001
    linux kernel: Type: Direct-Access ANSI SCSI revision: 02
    linux /etc/hotplug/usb.agent[6929]: need a device for this command
    linux kernel: SCSI device sda: 126977 512-byte hdwr sectors (65 MB)
    linux kernel: sda: assuming Write Enabled
    linux kernel: sda: assuming drive cache: write through
    linux kernel: sda:end_request: I/O error, dev sda, sector 126976
    linux kernel: Buffer I/O error on device sda, logical block 126976
    linux /etc/hotplug/block.agent[6994]: new block device /block/sda

    Linux seems to be trying to doing something with sector 126976, which seems to
    be somewhere up by 65MB, ie beyond what Suse 9.0 is saying is written in the
    partition table.

    But again, the camera is different: the log has no errors in it when I plug
    the camera in. So again this may be a red herring.

    Do these observations suggest any causes / solutions to anyone?

    Thanks

    Steve
    Dundee, UK

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