11-09-2021, 05:10 PM
(This post was last modified: 11-09-2021, 05:51 PM by Dendrocalamus64.)
Failure may not be related to nand wear at all. This was a recurring problem on the Samsung Galaxy S3 and Note 2 eight years ago.
eMMC sudden death research
There can be a bug in the firmware code running on the emmc controller which corrupts its internal data. Sudden failures of SD cards may be caused by a similar problem. I've just read about plenty of those on photography boards. They are now designing pro cameras with two slots so they can mirror the data across two cards to reduce the risk of data loss from sudden failure.
The most recent version of the Jedec eMMC spec I've so far found for free download:
https://tuxdoc.com/downloadFile/jesd84-b51_pdf
eMMC sudden death research
Quote:Hi, my S3 bricked and even a JTAG could not save it. Yes, the eMMC was bricked at the very low level.
Samsung replaced my board and i checked it is now running 0xf7 revision, the sammy engineer also told me this is a safe fw immune to that superbrick. After further questioning and hardcore probing - the engineer revealed that the eMMC fw of 0xf1 has a bug in its wear leveling algorithm, which causes the sector containing the BIOS to be damaged, and this fw will fix that.
There can be a bug in the firmware code running on the emmc controller which corrupts its internal data. Sudden failures of SD cards may be caused by a similar problem. I've just read about plenty of those on photography boards. They are now designing pro cameras with two slots so they can mirror the data across two cards to reduce the risk of data loss from sudden failure.
The most recent version of the Jedec eMMC spec I've so far found for free download:
https://tuxdoc.com/downloadFile/jesd84-b51_pdf
Code:
JESD84-B51A Jan 2019
JESD84-B51 Feb 2015 <-- This one