> If you hammer an SD card writing a byte at a time (okay a line at a time)
> then you kill the writes.

Is there really a problem with writing a byte or line at a time? It seems
the issue is the number of times a sector gets erased. On several systems
I've designed, I log to SPI flash. I have a function prototyped like this"

UINT32 ExtFlashStreamProgram(UINT32 Addr, UINT8 *pData, UINT32 NumBytes)

This returns the next address that would be written. If a byte is about to
be written to the first address of a sector, the sector is erased, then
programmed. My logs typically take several sectors (logging goes to
everything not used for something else).

So, is the issue the number of write instructions, or is it the number of
sector erases?

Thanks!

Harold


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