for the 6650 there's a lot of information in the thread 'Reverse ATA tool for ND 6750 (noob)'. If you read this thread, you'll know what to do to make your new drive work with most of the Toshibas. The tools and firmwares you'll need, you shall find in the relevant section at http://liggydee.cdfreaks.com/ .
I (also Newbie) just got the ND7750, for which they don't have these tools yet... and I wish I had ordered the ND6650 instead.
The worrying information for you using the M35 :doh: is the compatibility talble which is supplied in the article you refer to! It clearly says 'Toshiba M35-S359 --> NOT compatible'. So, after the problems I even face with a compatible configuration (after two days it's still not over...) I'd seriously recommend you to use your money-back-guarantee if you have one :sad: and choose another drive.
Hope the info can save you from a lot of trouble . Being German myself, I can help you with partial translation from the article, if it really helps you. Let me know.