The HP models that are dual HD capable are truly outstanding laptops.
I have the DV8110 and installed the second, optional hard drive myself. I also purchased the HP DV9330 and have again purchased the second HD.
I was banging my head for months trying to find a caddy for the 8110 because the HP response for the part request was "you have to buy the hard drive from us to get the caddy". Typical. Their prices are of course triple the cost of the OEM drive itself.
I kept diligently searching and finally found a listing for the caddy and bought it for I think $12.
I am still looking for the 9330 bracket, however HP pulled a fast one on this unit. The drive requires a plastic connection adapter because the drive drops straight down into the hard drive compartment and into a vertically slotted connection receiver built into the board. There is no way to interface the drive without this special adapter. Hopefully, it will be part of the caddy package when it becomes available.
A few things have been mentioned regarding the reliability of dual hard drive laptops, and I would like to address them.
I am a professional full time DJ and use my laptops to perform with. I use professional DJ programs and peripherals including midi interfaces and PCMCIA or USB based 24 bit sound cards, DMX lighting controllers, etc.
I work these laptops constantly for 4 to 8 hours at a time, several nights per week. The drives are constantly running. Playing the songs, searching the database, accessing the swap file and whatever surreptitious tasks it normally performs, literally grinding the entire duration.
These particular laptops have always run medium cool under these circumstances, not once getting overly hot. The power supply and cooling system in the models with the dual hard drive option are suitable for this application because that is how they are sold off the shelf in some configurations. We are simply saving a few hundred dollars doing it ourselves, or want to incrementally 'max out' our laptops rather than shell out the money all at once.
I cannot speak to battery life because my most intensive use relies on AC power. However during my client meetings at the local Starbucks it happily goes online to view my website video demos via my Treo 700p/PDANet connection (I hate hotspot fees), navigates my Outlook Calendar and plays DVDs for the hour or so meeting time, all on battery power.
I believe my particular use demonstrates the robustness of these models in a most unique way and I am able to give both models I mentioned a big thumbs up. Keep in mind I haven't installed the second drive in the 9330 yet, but am running the peripherals I mentioned plus an external drive. It demonstrates the same reliability and resilience I have come to expect from the HP line.
I might also mention that the DV9330 comes with the Nvidia GeForce Go 7600 video card with 256MB dedicated RAM. An extreme video card for an extreme laptop. This is going to be my playback unit for music video DJ'ing (VJ'ing). A much more intensive task than simple music playback and mixing. VJ'ing involves playing back two or more videos simultaneously while mixing or 'scratching' the videos back and forth to create an extended dance set, compilation or entirely new composition using components of separate works.
If this won't kill it...nothing will.
Ken Wilson
San Diego, CA