Put in where the UMD drive was. However the N800 doesnt have that kind of generous space.
Maybe we could come up with something on these lines.
I dont see the necessity as the N800 has:
1. TWO full size SDHC card slots (confirmed working with two 16GB cards = 32GB - largest currently on the market). Will likely work with larger SDHC cards when available.
2. Can use a removable drive via the USB port (flash drives, flash card readers, HDDs - requires own power source, etc).
Besides, for media purposes, you can always wireless connect to a UPNP Media Server.
At the moment, I use a 8GB SDHC card with my N800.. and I'm happy.. waiting for 32GB SDHC to come out for next upgrade.. 40GB is a nice round number.. Funny thing is the 32GB card will likely cost more than the N800 when it comes out