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I tried different memory cards once in my 505. The speed rating of the card definitely makes a difference (I tried several Sandisk cards rated at different speed and I could actually get different burst rates on my SLR to really see the difference).
Then I tried the memory sticks. I had the feeling that they were slightly faster than the same speed rated SD cards, allthough not really noticeable. The biggest change was with different speed rates.
As long as you go with the Sony FW, everytime you add/remove a file from any memory location will result in a rescan. I guess the FW is checking whether or not there is a change in file number. If so (as the reader cannot know what has changed), the reader starts rebuilding the database again.
I've had several mp3 players so far and some did the same thing. Others checked each memory space seperately, so building the database was easier there. And some I think actually tried to just implement the newly added/removed file information which seems to me the best solution.
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