If that is the issue, then at least it's sussed.  I was fascinated more by 
the techy discussion of memory types, not heard arguments like that since 
Uni.  And I still remember De Morgan's theorum.

----- Original Message ----- 
From: "M. Taylor" <[email protected]>
To: <[email protected]>
Sent: Tuesday, November 04, 2014 10:29 PM
Subject: Potential Recall: Technical Defects of iPhone 6+ Raise Questions 
about Controller I.C.


See link to article at end of text.

Mark

Huge Potential Recall
Technical Defects of iPhone 6+ Raise Questions about Controller IC

November 2014
Functional defects in some of Apple's latest smartphones have been observed.

According to overseas IT news sites on Nov. 2, problems have been reported
related to data storage in the iPhone 6 and iPhone 6+.

Business Insider reported on Oct. 24 that a number of 128GB iPhone 6+ users
have reported functional defects via Twitter. When owners switch between
apps or check notifications, the phone is said to inexplicably crash or
enter a reboot loop.

Apple Insider also reported on Oct. 23 that some owners have replaced their
iPhone 6+ four times. It was also pointed out that Apple's recent iOS 8.1
update did not fix these defects.

Some in the industry point out that considering that technical defects
mainly occur in the 128GB version of the iPhone 6 Plus, there might be a
problem in the controller IC of triple-level cell (TLC) NAND flash.

TLC flash is a type of solid-state NAND flash memory that stores three bits
of data per flash media cell. It can store two to three times as much data
as a single-level cell (SLC) that stores one bit of data and a multi-level
cell (MLC) solid-state flash memory that stores two bits of data. Moreover,
TLC flash is more affordable. However, TLC is slower than SLC or MLC in
reading and writing data.

To reduce cost, Apple reportedly used TLC NAND flash in the 128GB version of
the iPhone 6+ and some other models. Previously, TLC NAND was used in some
iPads, whereas more expensive but more stable MLC NAND was used in most of
the iPhone series.

As numerous reports of low read performance of the Samsung SSD 840 and 840
EVO using TLC NAND flash have surfaced on the Internet, a problem in the
controller IC is considered to be the more likely cause of the defects. As
the controversy over the SSD 840 and 840 EVO grew, Samsung embarked on
firmware upgrades. Some in the industry think that if TLC flash is indeed
the cause of the defects, Apple might recall all of the products that have
been sold so far.

http://www.businesskorea.co.kr/article/7084/huge-potential-recall-technical-
defects-iphone-6-raise-questions-about-controller-ic



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