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How to use Java to Index entire hard drive / filesystem?

To me this looks like a duplicate of Monitor subfolders with a Java watch service

You can watch subdirectories like this:

 * Register the given directory, and all its sub-directories, with the
private void registerAll(final Path start) throws IOException {
    // register directory and sub-directories
    Files.walkFileTree(start, new SimpleFileVisitor<Path>() {
        public FileVisitResult preVisitDirectory(Path dir,
BasicFileAttributes attrs)
            throws IOException {
                dir.register(watcher, ENTRY_CREATE, ENTRY_DELETE,
                return FileVisitResult.CONTINUE;

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