Date   : Mon, 20 Dec 2010 09:08:14 +1100
From   : awilliams@... (Alan Williams)
Subject: Harddisc fakery using a microcontroller - back

Alan Said:
>The SD card is perfectly happy to let you write sectors at random, but 
>once done you have to arrange an erase in order to do it again.

John  Kortink said:
No, you don't. Erasure is always automatic.

Erase commands only offer the possibility of performance optimization.
E.g., rather than letting the on-board controller decide what to erase
and when, it may pay to erase smaller or larger areas in one go, or to
increase the perceived or real-time write performance by erasing ahead
of time.

Alan said:
Thank you for that.  I just skimmed through the SD card spec and knowing
erasure is usually a cause of grief with flash read that section more
thoroughly than the earlier sections.

My faith in modern technology is restored, & my hefty slice of humble
pie eaten.

Alan