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Sounds like a damaged flash card, or a broken file system. If it's a Windows PC, insert the flash card, then press WinKey+R (or go to Start -> Run) and type diskmgmt.msc, then click OK. You should be able to see your flash card within the list, and see if it's got any partitions listed. In this case, I've got a 2GB SDHC card plugged in, which shows up as ...
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