Re: [gentoo-user] Mounting USB Storage Devices

[Zac Medico <zmedico@gmail.com>]

Matthias Schweinoch wrote:
> Hi all,
> 
> I'm running Gentoo 2005.0 with an up-to-date portage tree, and I'm
> having some trouble getting an external USB harddisk running. My kernel
> is a 2.6.11-gentoo-r9. I have compiled USB support and SCSI
> support into the kernel.
> 
> When I attach the harddisk via USB, the following output is produced in
> /var/log/messages:
> 
> Jul 12 23:47:25 genbox usb 1-1.1: new full speed USB device using
> ohci_hcd and address 6  
> Jul 12 23:47:25 genbox scsi2 : SCSI emulation for USB Mass Storage
> devices  
> Jul 12 23:47:25 genbox usb-storage: device found at 6 
> Jul 12 23:47:25 genbox usb-storage: waiting for device to settle before
> scanning  
> Jul 12 23:47:30 genbox Vendor: TOSHIBA   Model: MK4004GAH    Rev: 0811 
> Jul 12 23:47:30 genbox Type:   Direct-Access  ANSI SCSI revision: 00 
> 
> Jul 12 23:47:30 genbox Attached scsi generic sg0
> at scsi2, channel 0, id 0, lun 0,  type 0  
> Jul 12 23:47:30 genbox usb-storage: device scan complete 
> Jul 12 23:47:30 genbox scsi.agent[8603]: disk at
> /devices/pci0000:00/0000:00:03.0/usb1/1-1/1-1.1/1-1.1:1.0/host2/target2
> :0:0/2:0:0:0 
> 
> Running 'lsusb' gives me the following for device 6:
> 
> Bus 001 Device 006: ID 2735:1005
> 
> 'sg_scan' produces the following ouput:
> 
> /dev/sg0: scsi2 channel=0 id=0 lun=0 [em]
> 
> I would think this all looks pretty good, i.e. I would expect to be able
> to mount the drive by doing something like:
> 
> mount /dev/sg0 /mnt/usbstorage
> 
> However, if I try this, mount produces an output saying that the device
> is not a block device. 
> 
> I'm pretty much out out ideas, and I'd welcome any suggestions.
> 
> Sincerely,
> 
>   Matthias

Normally the kernel will assign a device such as sda (in addition to sg0).  The kernel documentation for USB_STORAGE says that you need BLK_DEV_SD enabled.  Is it?  If it's modular then the hotplug scsi.agent script is supposed to load it (sd_mod).

$ gzcat /proc/config.gz | grep -i BLK_DEV_SD
CONFIG_BLK_DEV_SD=y

Zac
-- 
gentoo-user@gentoo.org mailing list