jffs2 doubts

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Hi,
 I have couple of doubts regarding jffs2 filesystem.

1. I've found instances of writing mtd partitions with dd (like dd if=rootfs.jffs2 of=/dev/mtd...) and another method is to use flash_erase /dev/mtd.. and then copying rootfs.jffs2 to /dev/mtd.. using cp command followed by sync. What is the difference between these two?.

2. How jffs2 works? I mean if my root partition is jffs2, if I access some files, is it accessed real-time from the flash device?

 OR

Does the kernel uncompress the jffs2 partition and stores it in memory during boot and access it from there when a read request comes?


TIA,
Arun


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