[ubuntu] 11.10 64 bit does not work with micro SDHC card

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http://ubuntuforums.org – I have a 4GB Kingston class 4 4GB micro SDHC card that I use for backing up files using my personal rsync script. On 10.04, 10.10, 11.04 it worked fine on the 32 bit OS. On 64 bit 11.10, files fail to be copied; sometimes they appeared to be copied, ls does not find the files but df -kh shows that disk space has been taken up. Reformatting the sdhc into DOS or ext3 format is no help; the result is the same. (Hardware)