Implementing a "sometimes" RAID on a laptop. (eSATA, SSD, RAID 1)

[linux guy]

On Wed, Dec 28, 2011 at 10:48 AM, Pete Travis <lists at petetravis.com> wrote:
> A 17" laptop cuts an awfully large profile.   Are you sure there aren't two
> SATA bays?

My XPS 17 will have 2 SATA bays.   One for the SSD with the OS and the
other for a conventional HD with my data.    I want to back both of
these drives up to an external drive.