21 Mar
2013
21 Mar
'13
12:25 a.m.
On Wed, 20 Mar 2013 17:50:15 -0400
David Riley <fraveydank at gmail.com> wrote:
I know. Sorry for being not clear in this. I intended
to write somthing
in the line of "SLC (and especialy old fashoned NOR) flash is OK, where
MLC and even more TLC flash is problematic. (MLC and TLC are mostly
NAND flash whitch may add to the problem.)"
--
\end{Jochen}
\ref{http://www.unixag-kl.fh-kl.de/~jkunz/}
Thats the
point. You talk about old devices. Those are based on SLC
flash. SLC (NOR) flash is OK. E.g. Atmel guarantees a data retention
time of 100 years for the flash in AVR microcontrollers. Currently as
new available SD cards are MLC and increasingly TLC (NAND) flash. MLC is
problematic and TLC even more.
SLC isn't necessarily NOR; there are plenty of
NAND
devices that use SLC. Likewise, there are NOR devices
that use MLC (not as common).