Ubuntu can't see new SATA drive

[Craig Hagerman]

I have a problem. I just installed a new SATA drive and Ubuntu doesn't
see it. I would appreciate any help in getting this set up.

A bit more in-depth information:

I have the root partition on an ATA drive. Until recently I have had
two SATA drives set up with LVM as one big 400 GB volume for storage.
I was running out of space and decided to get a new drive. I bought a
new 400 GB SATA drive and a USB external case. First, I put the new
drive in the external case, hooked it up and used gparted to create
one big ext3 partition. Then I copied all the files from the LVM
volume to the external.

Next I wiped the LVM volume, removed the LV and reformatted both of
those old SATA drives (ext3 again). My plan was to put the big (400)
new drive into the computer along with the next biggest (250) and put
the smaller one (200) into the USB external. the problem is that
Ubuntu will not recognise the new 400 GB drive inside the computer.

Both of the other SATA drives are recognised so I am confident that
the cables, motherboard, kernel, drivers, bios, etc are all working
correctly. Also the computer will recognise the 400GB drive when I put
it back into the USB external case. So there isn't a problem with the
drive.

This has me very puzzled. Any idea why the SATA is not recognised
inside the computer?

Craig