What happens at 20 percent exactly? Does the camera shut off? THAT right there just makes no sense!! even from a data standpoint. If the fucker is dying on the write, the parity check should kill it immediately, and it's SOLID STATE FFS!! You don't have field strengths, head sway, flutter or any of that BS to worry about on a write command on a 'control power crisis' event with a solid state device. They make solid state hard drives, which get written and re written CONSTANTLY that don't corrupt. You can get a fkn TERABYTES drive for a hundred bucks or so that will take probably millions of RW ops.
It's like the world is Digital HD, and they are clinging to their NTSC standards, lets snag another drive out of the TRS-80 shall we?
If it's that unreliable then the camera should shut itself OFF at that point, because for all purposes it is NOT USEABLE at that point. Im surprised there isn't a class action out on that yet, false advertisement, you claim 70 minutes and it only is reliable for 40 type thing.
No matter what, if it KNOWS it's power is waning and it's not like a blown fuse or something just yanking the plug, it should shut itself OFF, NOT corrupt the file! Throw in an extra $3.00 of chips to have a volt reg for your write assembly so if it's sagging, you BOOST IT, then once you see it's sagging, TURN THE CAMERA OFF before it CORRUPTS!!
Sorry for the rant, but that is just poor 3rd world crap right there, you'd expect a lot better from a company as big as them.
Let me do a bit of research and see what I can find as for the highest quality chips you can get. It's a lot to do with the 'cells' how many spares .vs. how fast they are expected to corrupt, stuff like that but let's not get too geeky.
Aaron