Well, seeing that you'd need a power and SATA splitter, it's not worth it. For the price of two 1.8"s, you can get the 160GB 2.5"
???
A 1.8" Intel G2 160gb is about the same price(+25 roughly$) as the 2.5''. So my guess is why not try and fit two SSDs in the same space and double the capacity.
two X-18Ms at 160gb
or one X-25M 160gb
???
A 1.8" Intel G2 160gb is about the same price(+25 roughly$) as the 2.5''. So my guess is why not try and fit two SSDs in the same space and double the capacity.
two X-18Ms at 160gb
or one X-25M 160gb
You cannot fit 2x 1.8" SSDs since they're physically not 1/2 the size of a 2.5" anyways. You'll run out of room in the first place.
Secondly, the connection for the hard drive allows 1 SATA device, not 2. There are port replication technologies but there aren't any available for a laptop.
Your idea is impressive but it's not possible at this time.