FW: [OT] Cf Card vs DiskOnChip

[Alex Lennon]

Hi Charles,

>>move stuff around and level out the wearing.  Some devices do not apply
wear
>>levelling (eg. Compact Flash and SmartMedia). Some do (eg. full-size
PCMCIA
>>cards, DOC, JFFS).

The lack of wear-levelling on CF comes as a surprise - could you comment on
whether the various manufacturers, such as Sandisk are making this
assertion?

The closest we have seen is in the CF Sandisk spec. where they state they
support wear levelling - but that this '.. is an intrinsic part of the Erase
Pooling functionality of NAND memory...', '...if necessary, CF cards will
rewrite data from a defective sector to a good sector...'.

With this type of statement it certainly doesn't appear that our flash
lifetime calculations for a 'true' wear-levelling implementation would
hold for CF.

Best,

-Alex


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