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kinds of media storage
Kinds of media storage
TYPES OF STORAGE MEDIA storage media consisting of several types, namely: • Cache Memory • Main Memory • Flash Memory • Magnetic Disc Storage OVERVIEW OF PHYSICAL There are several types of data storage media on a computer system. Data storage is distinguished by: • Speed Data Access • Price of Media Storage • Reliability of Media Storage Media storage of information in computer system is divided into 2 main types: Storage Primary / Primary Storage. Characteristics: • high-speed access • The price is relatively expensive • Capacity relatively small • Volatile Secondary Storage / Secondary Storage. Characteristics: • low access speed • The price is relatively cheap • relatively large capacity • Non-volatile CACHE MEMORY • Memory cache has the fastest data access • Cache Memory is the most expensive storage • Capacity of the Small Cache Memory (eg 256 KB - I MB) • Having the volatile nature • Cache Memory is usually located on the Mainboard • Typically the processor will look for data in memory cache first before looking for the main memory data data • Usually located in the data cache memory is data that are often read MAIN MEMORY (RAM) • A deposit of data during computer operation • The price is still relatively expensive • Capacity is relatively small (eg 64 MB - 1 GB) • relatively faster access speed • volatile nature FLASH MEMORY • A deposit of data that is widely used today • Using the workings of EEPROM (electrically programmable read only memory eraseable) • Capacity is relatively smaller than main memory • Non-volatile • Relative speed is slower than main memory MAGNETIC STORAGE-DISC • Capacity is relatively large (1 GB - 100 GB) • relatively slow speed • Relatively Cheaper Prices • Non-volatile • Represents the storage media of the most widely used • Capacity continues to grow, as applications are increasingly developing a computer system • large databases usually require more than 1 hard disk for storage • Physical disk made of a magnetic disk made of a number plate / disc. The surface of each disc (up / down) made of materials that easily magnetized iron • Recording data • In a magnetic disk code on and off are represented by the position of magnetic element • With mengimbas surface of the disc with a magnet (which is on the head), changing the position of the magnetic element. This means that code can be replaced on the off and vice versa • The holes in the surface of the disc represents the data that are arranged in a line called the track. Data stored in the form of concentric tracks • Each track is divided into sectors (blocks) • Magnetic disks are organized into cylinders • Cylinders are the same tracks on the surfaces of the discs of different • Head R / W store information extracted from the magnetization of the existing sectors under • Head R / W float above the platter surface • If the Head of the R / W touch the surface of the plate, then there is the underlying data will be corrupted • Disc Controller is the interface between computer systems and hardware to receive commands from the hard drive read / write on a sector • Disc controller is also responsible for remapping bad sectors, so the data is not stored in bad sectors on your hard disk • Capacity • Access time (access time): start time of the request read / write to the data transfer begins • Average time data transfer (data-transfer rate): the average time taken or saved data to the hard drive (eg, 4-8 MB per second) • Reliability • Process I / O on the disk is determined by the operating system • Every process I / O will request the address of the data on the disk, also called the block number (block number) • The size of blocks ranges from 512 kb - 4096 kb • Data is transferred between memory and disk in a block size • Because access to data on the hard drive is slower than access to data in memory, then the common bottleneck • Development done on techniques to improve speed of access block on the disk Access time consists of: • Seek time: Time required to put the R / W head at the desired cylinder (eg 20-30 milliseconds) • Rotational latency TIME: The time needed to wait until the data are under the R / W head. Usually sekitas 5400 RPM - 15,000 RPM Some of the techniques developed in the repair of the access speed of the block on the disk: • Scheduling (scheduling) • File organization (the organization of files) • Non-volatile write buffers (writing in non-volatile buffer) • Log disk
TYPES OF STORAGE MEDIA storage media consisting of several types, namely: • Cache Memory • Main Memory • Flash Memory • Magnetic Disc Storage OVERVIEW OF PHYSICAL There are several types of data storage media on a computer system. Data storage is distinguished by: • Speed Data Access • Price of Media Storage • Reliability of Media Storage Media storage of information in computer system is divided into 2 main types: Storage Primary / Primary Storage. Characteristics: • high-speed access • The price is relatively expensive • Capacity relatively small • Volatile Secondary Storage / Secondary Storage. Characteristics: • low access speed • The price is relatively cheap • relatively large capacity • Non-volatile CACHE MEMORY • Memory cache has the fastest data access • Cache Memory is the most expensive storage • Capacity of the Small Cache Memory (eg 256 KB - I MB) • Having the volatile nature • Cache Memory is usually located on the Mainboard • Typically the processor will look for data in memory cache first before looking for the main memory data data • Usually located in the data cache memory is data that are often read MAIN MEMORY (RAM) • A deposit of data during computer operation • The price is still relatively expensive • Capacity is relatively small (eg 64 MB - 1 GB) • relatively faster access speed • volatile nature FLASH MEMORY • A deposit of data that is widely used today • Using the workings of EEPROM (electrically programmable read only memory eraseable) • Capacity is relatively smaller than main memory • Non-volatile • Relative speed is slower than main memory MAGNETIC STORAGE-DISC • Capacity is relatively large (1 GB - 100 GB) • relatively slow speed • Relatively Cheaper Prices • Non-volatile • Represents the storage media of the most widely used • Capacity continues to grow, as applications are increasingly developing a computer system • large databases usually require more than 1 hard disk for storage • Physical disk made of a magnetic disk made of a number plate / disc. The surface of each disc (up / down) made of materials that easily magnetized iron • Recording data • In a magnetic disk code on and off are represented by the position of magnetic element • With mengimbas surface of the disc with a magnet (which is on the head), changing the position of the magnetic element. This means that code can be replaced on the off and vice versa • The holes in the surface of the disc represents the data that are arranged in a line called the track. Data stored in the form of concentric tracks • Each track is divided into sectors (blocks) • Magnetic disks are organized into cylinders • Cylinders are the same tracks on the surfaces of the discs of different • Head R / W store information extracted from the magnetization of the existing sectors under • Head R / W float above the platter surface • If the Head of the R / W touch the surface of the plate, then there is the underlying data will be corrupted • Disc Controller is the interface between computer systems and hardware to receive commands from the hard drive read / write on a sector • Disc controller is also responsible for remapping bad sectors, so the data is not stored in bad sectors on your hard disk • Capacity • Access time (access time): start time of the request read / write to the data transfer begins • Average time data transfer (data-transfer rate): the average time taken or saved data to the hard drive (eg, 4-8 MB per second) • Reliability • Process I / O on the disk is determined by the operating system • Every process I / O will request the address of the data on the disk, also called the block number (block number) • The size of blocks ranges from 512 kb - 4096 kb • Data is transferred between memory and disk in a block size • Because access to data on the hard drive is slower than access to data in memory, then the common bottleneck • Development done on techniques to improve speed of access block on the disk Access time consists of: • Seek time: Time required to put the R / W head at the desired cylinder (eg 20-30 milliseconds) • Rotational latency TIME: The time needed to wait until the data are under the R / W head. Usually sekitas 5400 RPM - 15,000 RPM Some of the techniques developed in the repair of the access speed of the block on the disk: • Scheduling (scheduling) • File organization (the organization of files) • Non-volatile write buffers (writing in non-volatile buffer) • Log disk
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