FW: [OT] Cf Card vs DiskOnChip

Alex Lennon ajlennon at arcom.co.uk
Mon Jan 28 13:36:08 EST 2002

Hi Charles,

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

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.



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