> How, and are you, powering down the card after an operation?

Power is continuous. The only non-data activity is when the PIC
sets CS for ~700us during the " > 74 clock cycles " re-init after
a data time-out.=20

Roughly the timing per second is 300ms to read/process data,
700ms until next read request, all with CS low apart from the
700us high, as above

The only power-downs have been when I see that the read has
failed sometime during the night. Which, of course, is the actual
problem. "something" happens in the controller after thousands
of reads to make further reads flakey, but it's not a fatal physical
"something" as it can be cured. I hope today to find out what
the minimum cure is, preferably less than a re-format / reload

I don't recall any instruction or recommendation to have CS high
when data isn't needed. In the pdfs I have there's very little about
CS.

I'll re-read them to see if I missed anything in the SD mode
section that applies to but isn't included in the SPI mode section.
Perhaps there's a counter or register that needs periodic reseting
or refreshing=20

Joe


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