Sure if you want over 1/3 of the price of the console to be the HDD. Then again that's probably better than an SSD. But...
The best choice for speed + cost would be a 3.5" hybrid drive. Next best would probably be a 2.5" hybrid drive, and that's probably slightly more likely. Initial game load would be slower than an SSD, but once the game is loaded it could start to intelligently fill the flash buffer (say 10-20 GB) with the game data of the game you are playing. Hence once that data needs to be accessed it'll be like accessing it from an SSD.
I have yet to see an asset streaming solution (other than ones that stream in data that is outside of the players view range) that doesn't feature significant texture pop-in with quick movements or changes to view. And most especially when you first enter the game.
Hence I still prefer either full level load at the start, or all visible assets + all assets that might become visible in the next 2+ minutes of gameplay loaded at start with streaming data only being applicable to things that might be coming up in the next 2+ minutes.
It's absolutely ridiculous that we have more texture and object pop-in now than we did 10 years ago (at least on PC which is like a sneak peak of what consoles will be like for the next generation).
Regards,
SB
I would expect them to use a 320-500GB drive, considering i can get a PS3 with a 320GB today and the price difference between a 160 is very low i see no reason for them to go lower than 320. And i expect the speed in 2013 to be just as good.
With most games today having to be playable on a Console with a slow dvd or bluray drive things can only improve if we lose the stupid rule of no hard drive requirement.