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16GB and 32GB 3D XPoint packages side by side (480GB model).
280GB: 14x16GB front / 7x16GB rear — 336GB total
480GB: 7x16GB+7x32GB front / 14x16GB rear — 560GB total
Now I know what you're thinking. If Optane doesn't need overprovisioning or a large spare area in the same sense as NAND flash SSDs, then why on earth do these parts have on the order of 20% extra 3D XPoint installed? Intel's official response to that question is “3D XPoint™ memory media does not require over-provisioning. We aren’t disclosing the use of the additional media at this time.”, which is fair enough, but I can hypothesize a bit based on my knowledge of the history of this controller in particular and of storage media technologies in general:
Raw 3D XPoint dies do not have built-in space or mechanisms for ECC (error correction).
Remember these are addressed more like RAM than like NAND flash. It is entirely possible that Intel set up their channels in a RAID-6 style configuration, effectively making it into a 12-channel controller with two effective channels for parity.
After doing that math, we still end up with ~3.3% left over for any metadata or spares.
Unproven, newer technologies will typically be made with a greater design margin.
Kudos for Intel for (theoretically) going way over the top on error correction and redundancy here. It makes sense to do this for the first iterations of any storage product, regardless of the companies confidence in the technology.
Который год уже пытаются, а «воз» и ныне там: Maemo, MeeGo, Tizen, Sailfish OS, Ubuntu Touch, и т.д., и т.п.