I have a USB Compact Flash card reader that worked fine before I reinstall the Redhat Linux 7.2. There are 2 partitions on the CF card, one is msdos and one is ext3. I usually mounted the card as followed:

#mount -t msdos /dev/sda1 /mnt/cf1
#mount -t ext3 /dev/sda2 /mnt/cf2

After I reinstalled the O/S, I can't mount it anymore. It gave me following message when I tried to mount either one of them:

#mount -t ext3 /dev/sda2 /mnt/cf2
mount: /dev/sda2: unknown device

When I plug in/out of the card reader, dmesg doesn't give any messages.

What should I do to be able to mount it?

Thanks.

Does your new os support USB storage?

Happy Penguins!

Check the output of:

# lsmod

Make sure you have the usb, scsi and usb-storage modules loaded. Post the output here is you're not sure which modules should be loaded.

Yes, it supports it.

Here is the results. Thanks.
# lsmod
usb-storage
usbcore
scsi_mod
ide-cd
cdrom
soundcore
binfmt_misc
ds
yenta_socket
pcmcia_core
autofs
eepro100
appletalk
ipx
ipchains
ext3
jpd

I do not see usb-uhci, usb-ohci (USB 1) or ehci-hcd (USB 2) loading. Which one depends on the USB controller. I believe 7.2 predates USB 2

BTW any reason your still running RH 7.2?

Thank you so much. It worked after I ran modprobe usb-uhci. By the way, how do I make the module run on startups?

Our company has been using RH7.2 since the day I started my job. I thought about upgrading it but was afraid of incompatibility. Do you have any suggestion on what version I can upgrade to without jeopordizing maintenance of and compatability with applications developed on RH7.2 version. Thanks.

Add this line to the /etc/modules.conf file
alias usb-controller usb-uhci

Without knowing the type of applications and/or specific hardware I can not say that upgrading will not jeopordize your existing setup.

Hi Michael,

When I tried to insmod usb-storage this morning, it suddenly gave a lot of unresolved symbols errors, such as:

unresolved symbol usb_dev_dev_Rd9C59bfb
unresolved symbol usb_control_msg_R510fe757
etc.

It was working fine last week. How do I get it work again?

Thanks.