On an application's canvas page (the page where an application lives on Facebook), the application has more control of the feel of the page, so fb: SWF renders as a normal embeddedFlash object.
The second version, JFFS2, is emerging as the de facto filesystem for raw flash chips for tiny embedded devices.
第二个版本，JFFS2，作为用于微型嵌入式设备的原始闪存芯片的实际文件系统而出现。
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Perhaps most importantly, JFFS2 was specifically created for embedded devices like flash chips, so its overall design provides better flash management.