World In Technology

Magnetic DISC • The capacity to continue growing, because the computer application system growing • Database, which usually requires a large more than 1 hard disk for storage • Phisik a disk made of material Magnetic disks are made from a number of plate / disc. The surface of each disc (top / bottom) made of materials that are easy to iron magnetisasi. Recording data • In the Magnetic disks on and off the code is represented by elements magnetiknya position. • In Looking surface of the disk with magnets (which is on the head), the magnet element changed. This means that the code can be changed on-off and vice versa. • hole-hole in the surface of the disk represents the data arranged in a point called the track. Data stored in the form of concentric tracks (full circle) • Each track is divided into sector-sector (block). • Magnetic disks organized into a cylinder-cylinder. • Cylinders is the track on the same surface-surface on the disc-disc different. • Head R / W store information ta...

DATA STORAGE MEDIA • There are several types of data storage media on the computer system • Data storage is distinguished by: • Speed Data Access • The price of Media Storage • Reliability of the Media Storage GENERAL INVESTMENT PHYSICAL MEDIA STORAGE Media storage of information in the computer system is divided into 2 main types: • Storage Primary / Primary Storage Features: o high-speed access o The price is expensive relative o Capacity relative small o Volatile • Storage secondary / Secondary Storage Cirri-characteristics: o low-speed access o The price is cheap relative o Capacity of relative o Non-volatile EXEMPLARY MEDIA STORAGE Some examples Media Storage: • Memory Cache • Main Memory • Flash Memory • Magnetic Disc Storage • Optical Storage • Tape Storage Cache MEMORY • Memory Chache have access to the data quickly. • Cache Memory storage is the most expensive • Capacity Memory Cache most Small (eg 256 KB - I MB) • Having a volatile nature • Cache memory is usually located...

Database A Data Base Management System (DBMS) consists of a set of inter-related data and a set of programs that make access to the data The objectives of the DBMS is the most efficient and 'convinient' Management of data involving both the structure and mechanism of information in their manipulation of information. Components Database • DATA, the data stored in integrated and used together • hardware, hardware used in managing the database system • SOFTWARE, software intermediary between users with physical data. software can be a data base management system and the various application programs • USER, as a user of the system • Property is important DBMS data independency, which can be described as a condition in which data and application programs independent in the sense that the changes do not affect each other. • Program applications are not affected by the changes made to the data and how data is organized by the physical DBMS • DBMS gave abstraction the management of inf...