Thank you Sasha.
The TT58G2JAJA chip came in my case from a Sony USM-X series:
http://www.sony.net/Products/Media/Micr ... cts/usm-x/Sony isn't really what we call a small company ...
And the sticks came with a 5-years warranty.
Well, this is also marketing, but Sony is a renowned brand and if the chips were poor quality, they probably wouldn't take the risk to see too many coming back in the next 5 years.
From what I read, the same chip was however also used by Kingston DataTraveler, probably on the lower segment with two years warranty (as for the DataTraveler).
I purchased several Sony USM-X series in the context of a flash stick repair.
The one with a 8 GB stick was branded Toshiba.
The 32 GB ones were "no names", but seemed labeled according Toshiba's naming conventions.
There could be other reasons to "no-name" chips. Toshiba may sell its technology under license, or sell/rent older some production chains to finance new ones, a.s.o.
But maybe are you more informed than me.
Are you sure that the second "T" on a Toshiba model is not for "
TLC".
It seem that this second letter was codified as the NAND type in the past (see the document that I attached in the original post).
Maybe, with enough "TT..." chips it would be possible to check if all are TLC or not.
The chip that you highlighted is a TT
17G2JAJA, not a TT
58G2JAJA.
When you read a chip, how are you sure that you don't damage it with overvoltage?
So, how do you know that the chip doesn't work at 1.8V, especially when the chip is not in databases?