>I dont understand why some of you use the SD as Primary and >the CF as secondary ? Is the SD not slower than the CF ? Would >your camera not be slower to write files to disc if it was >using the SD as primary ?
I don't think it matters for a different reason, I think it is more or less the sum of the write times, and I would be surprised if it matters.
That said, I use CF as primary. I feel CF are more reliable, but right now they are more expensive, so it is cheaper to buy big SD than big CF. You need a bigger SD than CF if (IF) you look at and review and delete your shots. Deletes only work on the primary, so the secondary will have all the bad shots as well as good, and so will fill up quicker.