{Spam} Yaffs2 remount problem

Hi there~~
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I build yaffs2 file system, then I copy a file to mounted nand flash. but, 
after unmount, and remount, I cannot find that file.
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but, when I try command df -h, flash used area is increased than before.
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I don't understand this problem.
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I already checked?/proc/mounts,?/proc/yaffs,?/proc/mtd, but, I cannot find 
problem from those. I may be seen ok.
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please, tips to me.?
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I use Samsung nand flash. (K9F2G08UM). it has 8bits data bus, 128K pages, 2048 
Blocks, 64 bytes oob, 2048 bytes page register. Driver is no problem in my 
checking...
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afewgoodman
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