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I cannot transfer files to an SDHC mini card when connected to my Windows 7 computer; no problem on my Windows Vista computer.  I've tried changing the drive letter because the drive shows "unallocated", but that didn't work.  The drive is showing up in My Computer.  I get an error message, "Cannot read from source file".  I've selected to give administrator options and everything I know to do to no avail.  Help!
				
			 
 
		 
 
		 Thanks for your help.
  Thanks for your help. 
 
		 
 
		