What will be the size of the NX inner memory (storage capacity)?

[Iyasu]

Chrizum said:
Nintendo has never really valued storage capacity. They'll probably have two models: a basic model with 16GB and a premium model with 64GB. It will be compatible with HDD's of course for more storage.

I wouldn't necessarily agree to that. They value storage capacity, just not as highly as other things.

N64 they valued higher piracy protection + control over the media + loading times (cartridges) over storage space (CD)
GCN they valued higher piracy protection (proprietrary mini DVD)  over storage space + paying licensing fees (DVD)
Wii they valued higher piracy protection (proprietrary DVD) over storage space + paying Sony licensing fees (BluRay)
Wii U they valued higher piracy protection (proprietrary BluRay) over storage space + paying Sony licensing fees (BluRay)

So Nintendo so far tries to limit the costs for making games, by generating more sales through less piracy or saving the money for licensing fees.

HDDs weren't much of an issue previous to the Wii U for Nintendo.

Specifically concerning the Wii U:
Nintendo said that one of the design philosophies for the Wii U was to make a system that consumed little energy, so that mothers could be happier. 
Putting that into perspective, it made sense to use flash storage over a physical hdd. Flash storage consumes less watts, is smaller and produces less heat. Yet due to how expensive flash storage was/is I guess they could only afford a small drive (8GB and 32GB). 

After the Wii U Nintendo should have learned some lessons concerning the internal storage.
-consumers complained about the limited storage
-consumers bought the version with more storage
-3rd parties should have told them that they need more space by now

If Nintendo uses a SSD the space will be limited again, but they should be able to afford 128GB or 256 GB. I also highly doubt they will continue the two model strategy, because the basic pack Wii U didn't sell. But since 500 GB and 1TB HDDs are so cheap in comparison they should prefer those, except if they need the benefits of an SSD for the OS/console design.