A type of rewritable optical disk that employs the phase change recording method. Using this technique, the disk drive writes data with a laser that changes spots on the disk between amorphous and crystalline states. An optical head reads data by detecting the difference in reflected light from amorphous and crystalline spots. A medium-intensity pulse can then restore the original crystalline structure.
Magneto-optical and dye-polymer technologies offer similar capabilities for developing re-writable optical disks.
- phase change memory
Abbreviated as PCM, phase change memory is a type of non-volatile memory that is much faster than the common flash memory, from 500 to 1,000 times faster, and it also uses up to one half the power. Phase change memory uses a semiconductor alloy that can be changed rapidly between an ordered, crystalline phase having […]
(fish´ing) (n.) The act of sending an email to a user falsely claiming to be an established legitimate enterprise in an attempt to scam the user into surrendering private information that will be used for identity theft. Phishing email will typically direct the user to visit a website where they are asked to update personal […]
- phone home
Phone home is the slang term used to describe a software installation function which will use an Internet connection, if one is found, to send information back to the developer, usually without the users knowledge.
- phonebook search operator
A Google search operator that you can use to restrict Google search to show results only from public U.S. telephone listings. The search engine results page (SERP) will show information including the name, address and phone number for the person you specify. For example, phonebook: John Doe New York NY will show phonebook listings of […]
- photo illustration
A type of computer art that begins with a digitized photograph. Using special image enhancement software, the artist can then apply a variety of special effects to transform the photo into a work of art.