Mark Rath wrote:

<<I have a USB Jump Drive -when I put files on it from my iBook running OS X then take 
it to another computer (Mac or Windows) it has every file on there twice one file will 
be myfile.doc and another will be _myfile.doc the files with the underscore will not 
open.>>

The Mac file system retains some of it's pre-OSX strangeness, in that a single file 
has two parts, called forks.  The data fork is what we normally associate with a 
file's contents.  The resource fork contains special data like the icon associated 
with a file, and info telling the Finder which program should be used to open it.  
Windows file systems have only a data fork.

Those strange files on your jump drive are the result of the Finder splitting the Mac 
files (with resource forks) into two files, a data file (normal file name) and 
resource file (prepended with ._ ).  It occurs because the USB drive is usually 
formatted in FAT16 (Windows format), which the Finder can read and write to but which 
cannot hold single files with both resource and data forks.

The extra files are harmless, though annoying.  If you truly intend to use only the 
data fork of a file, you might find that using a command line program like 'cp' might 
copy the data without cluttering up the drive with resource fork files.

Kurt

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