reading files writes to the filesystem???

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A customer of mine for our embedded products was relating to me his
worries about using Compact Flash with Linux. He claimed that Linux (in
ext2, ext3, possibly others) filesystems, when mounted read/write, will
write to the filesystem every-time a file is read, in order to update
some time-stamp (atime?) I don't believe him, but since I wasn't sure, i
couldn't argue with this. Is this true?


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