Was wondering if this was possible?? The NAND chip should be the same as xD picture cards, pin-for-pin. So, could one hook up a usb xd card reader's pins to where the NAND's are, and use xd cards as switchable NAND chips?

According to the xD-Picture Card Wiki, yes, it should be possible. See here: http://en.wikipedia.org/wiki/XD-Picture_Card

Why are you asking this in an XBox Forum?

/RJ

Because it would be useful for switching between kernel versions, right?

http://www.youtube.com/watch?v=fKXSACLBF8M

http://www.xboxhacker.net/index.php?topic=7683.0


:EDIT:
been thinking of doing this but 16mb xd cards are hard to come by and very expensive plus the cygnos is out now and the new way to read/write the nand is easy

32 and 64M xD should suffice as well as they use the same geometry (512byte user+16byte spare), as well one could reap a 16M (or 32/64M) NAND out of many old devices like really old jump drives or MS Duo. MMV.