1. When a client creates an HDFS file, it computes a checksum of each block of the file and stores these checksums in a separate hidden file in the same HDFS namespace.

2. This installation will enable intuitive video file descriptions of hidden file extensions.

3. Bash keeps a record of what the user has typed exactly and writes it to a hidden file called .bash_history within the user's home directory.

4. Once a file is hidden in an image the saved picture is still a picture, it will load just like any other image and appear as it did before, the only difference will be that it contains hidden file.

5. Today at Where 2.0 Pete Warden and I will announce the discovery that your iPhone, and your 3G iPad, is regularly recording the position of your device into a hidden file.