I could not mount an eSATA drive

It is something specific to the XFS filesystem.

XFS: This filesystem has a realtime volume, use rtdev=device option

That opton might be needed in the /etc/fstab file

That dmesg was given at a (what I will call) an "automatic" type mount.
I plugged the eSATA into a USB slot and that "attempt" occurred.
Based on its failure, I am now suspecting that I need to do a "manual" mount attempt.
Unfortunately all my unix experience is 20 years old.
I have been using Ubuntu Linux for two days now.
(It is remarkably usable to a rookie.)
I thought it was funny that Linux recognized an USB stick made in Windows 7.
I was running X Windows at the time and the USB stick ran just as it had in Windows 7
(better even),
Then I tried the eSATA with a Linux based content and it failed.
Thanks for your input!!

Do you have an eSATA port in that machine?

I doubt very seriously if I have a eSATA port on this PC. i didn't find one anyway. To my way of thinking, the machine was made before eSATA was popularized. The eSATA drive is in a Antec MX-1 enclosure which has both an HDMI and a USB connector. I'm using the USB connection to connect the eSATA to the PC. There is a eSATA "bracket" that came with the Antec MX-1. It is one of those that you plug into the back of the PC with a flat plat and a connector on it. If that was installed on my PC, I believe I "would have a eSATA port". There is one small picture about 1 inch square showing the installation which implys there is a Mother Board place to plug in the cable from the eSATA bracket.

The information you provided previously -

"It is something specific to the XFS filesystem.
XFS: This filesystem has a realtime volume, use rtdev=device option
That opton might be needed in the /etc/fstab file" -

unfortunately has no meaning to me.

I was told it was a EXT3+XFS partition and I saw in the Dmesg that the mount looked like is was
"going well" until it tried the XFS part.
Linux X Windows "Places" shows a 16 gb File system - "an unknown device"
/dev/sdb2. This was from the what I will call the "automatic mount attempt".
I think I need a mount command to use in what I will call "a manual mount attempt".

I sure apppreciate it if you gave me "your best guess" as to what that "manual mount attempt"
command would look like.

Thank You Very Much!!!

Well I looked about at DBSTALK and they showed some commands that did an XFSDUMP of one device to another. The command string did several mkdirs, making directories, I thought.
Were they somehow creating "mount points"????
I tried "my best guess" of a manual mount command which was
sudu mount -t xfs -o rtdev=/dev/sdb2 /dev/hr20
The /dev/hr20 was a mount point, I now guess, not a "nickname" for the device.
Because I got "Mount Point Does not Exist".
 And the dmesg looked about the same
I am stumped.
Your thoughts
TYVM!!

Well I thought I had "broken the code" ---- WRONG AGAIN

I tried:ed@ubuntu:~$ sudo mkdir /mnt/pta
ed@ubuntu:~$ sudo mount -t xfs -o rtdev=/dev/sdb2 /dev/sdb2 /mnt/pta
mount: /dev/sdb2 already mounted or /mnt/pta busy

"places" does show a 16bg file system - unknown device/dev/sdb2

ed@ubuntu:~$ umount /dev/sdb2
umount: /dev/sdb2 is not mounted (according to mtab)
ed@ubuntu:~$ sudo mount -t xfs -o rtdev=/dev/sdb2 /dev/sdb2 /mnt/pta
mount: /dev/sdb2 already mounted or /mnt/pta busy

I was getting "Mount point does not exist" until I did the:mkdir /mnt/pta
How can a directory be busy??
I'm stumped again!

If you smart guys (ie Masters of Linux) can't come up with the command
what chance does a 71 year old who has been using Linux for less than a week have?

I'm just about ready to give up (the fun is gone)!!
Thanks for all the assistance!!

ed@ubuntu:~$ sudo mount -t xfs -o rtdev=/dev/sdb3 /dev/sdb2 /mnt/pnta
Is the correct syntax in my case.
I get a "dirty block" in /dev/sdb2.
I now understand the you must do a "graceful shutdown" of the eSATA
or you get that "dirty block" from Linux.
It is not a Linux problem, and it is a DirecTV eSATA shutdown problem.
DirecTV HD-DVRs do a lot of "stuff" even when in the "off" position.
You have to do a DirecTV menu shutdown, and when all the leds go out, unplug it.
I should have done A WHOLE LOT MORE research before I started.
So many folks talked about the copying that I thought it was going to be simple.
Actually I think the process of copying an eSATA should come with a "Warning Label".
Sorry to have bothered you folks!!

Well team, I finally got this problem solved!!
The key to the puzzle was to get a "clean superblock" on the eSATA.
Using the menu, doing a "receiver reset" and unplugging the HD-DVR just as the LEDs go out.
I had turned off the UPS that had both the HD-DVR and the eSATA plugged in, which did not work, ie "dirty superblock".
When just the HD-DVR is unplugged at the "no LEDs" point of reset I got a clean superblock.
I did something like this
sudo mkdir /mnt/pnta
sudo mount -t xfs -o rtdev=/dev/sdb3 /dev/sdb2 /mnt/pnta
ls -lat /mnt/pnta
cd /mnt/pnta/mw_data
ls -lat
and I got the directory which showed (among other things) the various lines of recordings, their size and the date they were created.
THAT IS WHAT I WANTED ALL ALONG!!!!
Many Many Thanks for all your assistance!!