Stores large amounts of data, instructions, and information more permanently than main memory.
Devices for secondary storage Magnetic tape Magnetic disks Compact Disk Read-Only CD-ROM CD-RW (Compact Disk-Read Write) Write Once Read Many - (WORM) DVD – Digital Video Disks RAID (Redundant Array of Inexpensive Disks) Flash memory Removable storage 22
Hard Drives (SATA) 22 Four SATA cable connections for connecting drives to Motherboard. 4 drives max.
CABLES (SATA VS EIDE) 22 (SATA) Device , Power (PATA) Device , Power
ADVANTAGES (SATA VS PATA) 22 ADVANTAGES OF SATA OVER PATA: 1. FASTER 2. SMALLER CABLES AND CONNECTORS a. Small cables aid air flow inside the computer. Keeps parts cooler , thus they last longer. 3. LESS POWER CONSUMPTION 4. LOTS OF FUTURE IMPROVEMENTS. 5. ABOUT THE SAME RETAIL PRICE AS PATA.
DVD Read-Write (DVD-RW) 22 4.7 GB Smaller Pits, Narrower Track Pitch Inside On the inside, a DVD is totally different. Its pits are half the size of CD pits ( 0.4µm vs. 0.83µm ), and it's tracks are spaced about twice as close together ( 0.74µm vs. 1.6µm ). See following image... CD disk DVD disk 650-800 MB 40x /12x/48x
FINGERPRINT SCANNERS 28 Say goodbye to password hassles. Now you can log on to your computer and your favorite websites with the touch of your finger, without having to remember all those passwords - simply place your finger on the receiver whenever a password or username is required. Easy-to-use software makes replacing passwords with your fingerprint a breeze. The Registration Wizard helps you register fingerprints for each user. When you first visit a site that requires a password, just touch the Fingerprint Reader with your registered finger, enter your data, and then click OK. When you browse back to that website, you can simply log on with your fingerprint. You can also use the Fingerprint Reader to quickly switch between Windows user accounts without closing programs and files - and each user's personal content stays personal.
RFID (Radio Frequency ID) 28 Welcome to the world of Radio Frequency Identification, or RFID, where tiny computer chips smaller than a grain of sand will track everyday objects – and even people – keeping tabs on everything you own and everywhere you go. While it sounds far-fetched and futuristic, it's already here and documented in "SPYCHIPS," written by Katherine Albrecht and Liz McIntyre. These two privacy advocates have uncovered extraordinarily detailed plans to use this new technology to watch U.S. citizens. Revelations in the book include IBM's blueprint for a "Person Tracking Unit" that scans the RFID tags on unwitting members of the public as they move through retail stores, airports, train stations, elevators, libraries, theaters and even public restrooms. They intend to follow your every move.
RFID (Radio Frequency ID) 28 Nokia is developing an RFID-reader cell phone that could be used to scan people and inventory their belongings as they walk past on the street. Bank of America has cooked up a "Crowd Identification Device" to scan RFID tags on the things people are wearing and carrying to pinpoint, identify and bombard them with targeted audio advertising messages . There is even an RFID armband that delivers a dose of paralyzing medication or an electroshock to subdue individuals. These are just a few of the patents and patent applications revealed in "SPYCHIPS" that major corporations and the U.S. government have planned. The book chronicles efforts to keep these plans a secret , revealing the contents of confidential industry documents and outlining plans to "pacify" the public, co-opt public officials and develop spin to ensure the adoption of the RFID infrastructure.
RFID (Radio Frequency ID) 28 The book also discusses the industry's more underhanded tactics, like a foiled plot by the Grocery Manufacturers of America to mount a smear campaign against author Katherine Albrecht. As the authors were researching the book, illegal efforts were made by unknown persons to gather intelligence on them, including siphoning telephone records and targeting bank records. Someone even contacted their friends and family to probe for information, the authors say. Hundreds of millions of dollars have already been invested in what global corporations are calling the hottest new technology since the bar code – and billions more are in the balance. Wal-Mart's top suppliers are already on board with RFID tracking, and high-level former government officials like Tommy Thompson and Tom Ridge have joined the boards of major RFID companies. In fact, Thompson, former secretary of health and human services, now sits on the board of the VeriChip human implant company and has publicly suggested RFID implants for us all. " Spychips could strip away our last shreds of privacy and usher in a nightmare world of total surveillance – to keep us all on Big Brother's very short leash," say the authors
Types of Computer Systems Personal Computers (PCs) Small, inexpensive, often called microcomputers. Network Computers Used for accessing networks, especially the Internet. Workstations Fit between high-end microcomputers and low-end midrange. Midrange Computers Size of a three drawer file cabinet and accommodates several users at one time. Mainframe Computers Large and powerful, shared by hundreds concurrently. Supercomputers Most powerful with fastest processing speeds. 33