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When the Klez Worm infects a PC , it compiles a list of all e-mail addresses found on the infected PC 's hard disk . Suspend-to-Disk / Hibernate mode works in a similar fashion to Standby / Suspend mode except upon activation , the state of the notebook computer is written to a reserved area on the notebook computer 's hard disk drive . The mail spool files for all users are in a single " mail spool directory " ( / var / mail ) on one of the server 's hard disks . Its evolution was impossible to monitor with ground-based telescopes , because it could not be resolved on Neptune 's tiny disk , and its contribution to the disk-integrated brightness of Neptune confused by the presence of a rapidly-varying bright cloud feature , called the " Bright Companion " that usually accompanied the Great Dark spot . The message includes at least one file attachment ( the infected executable file ) , but may also include as many as five text files or Microsoft Word documents chosen at random from the infected PC 's hard disk . Further north , the planet 's entire disk will be visible but will remain within arc-seconds of the Sun 's limb . Persistent cookies have an expiration date and are stored on a user 's hard disk until that date .