I have 2 500 gig external usb hard drive's that I am trying to mount to my Ubuntu 9.04 server. I was able to mount one of them just fine using the following command:

mount /dev/sdb1 /media/sdb1

I tried to produce the same using the same code only changing sdb1 to sdc1 which was what Dmesg listed as the second usb drive connected.

Upon typing the code I get this error message:

mount: unknown filesystem type 'linux_raid_member'

Now the drive is not setup under any raid, and both hard drive are the same file system (ntfs), I have ntfs-3g installed but it didnt seem to make a difference with I ran the first mount command.

Any ideas?

*edit*
I just added the command shown above to my fstab to see I could get the successfully mounted sdb1 to mount auto on startup, and it gave me another error message like above but instead of 'linux_raid_member' it just as an empty ''

hmmm

Some external hard drives are actually raid devices. That is, they contain two hard drives in a raid configuration. Decide if this is the case for you, and then be sure to include the appropriate kernel module for supporting this.

Hope this helps