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I have Casio qv-3000ex and tried following commands to load modules for usb which seemingly worked:
1. modprobe sd_mod
2. modprobe usb-storage
3. modprobe usb-uhci
Now, doing "mount /dev/sda1 /camera" is giving following error message:
mount: /dev/sda1 is not a valid block device
In /var/log/messages following messages seem to be relevant:
Nov 10 13:03:17 haqim kernel: hub.c: USB new device connect on bus1/2, assigned device number 3
Nov 10 13:03:19 haqim kernel: cdrom: open failed.
Nov 10 13:03:21 haqim kernel: usb_control/bulk_msg: timeout
Nov 10 13:03:21 haqim kernel: usb.c: USB device not accepting new address=3 (error=-110)
Nov 10 13:05:31 haqim kernel: hub.c: USB new device connect on bus1/2, assigned device number 4
Nov 10 13:05:35 haqim kernel: usb_control/bulk_msg: timeout
Nov 10 13:05:35 haqim kernel: usb.c: USB device not accepting new address=4 (error=-110)
Nov 10 13:05:36 haqim kernel: hub.c: USB new device connect on bus1/2, assigned device number 5
Nov 10 13:05:40 haqim kernel: usb_control/bulk_msg: timeout
Nov 10 13:05:40 haqim kernel: usb.c: USB device not accepting new address=5 (error=-110
It doesn't look to be an issue with scsi, it seems that the camera just isn't being seen as a USB mass storage device. You can try a newer kernel, 2.4.18 from RH7.3 is about 8 months old now. There were a lot of mass storage fixes in 2.4.19.
Or, if it becomes a headache you can always buy your way around the problem by getting a USB CF reader, almost all of those are supported these days.