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Data Storage Technology. Present by Harry Magarang. Primary Storage V.S. Secondary Storage. What is the characteristics of primary and secondary storage?. Instruction and data currently executing programs flow to and from primary storage.
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Data Storage Technology Present by Harry Magarang
What is the characteristics of primary and secondary storage? • Instruction and data currently executing programs flow to and from primary storage. • Secondary storage hold programs that are not currently being executing, as well as group of data item that are too large to fit in primary storage.
Primary Storage • Static RAM (SRAM)
Primary Storage • Dynamic RAM (DRAM) • 3GB Dual Channel DDR2 Registered ECC SDRAM at 400MHz
Primary Storage • Flash RAM
Primary Storage • Flash RAM SamsungElectronics had developed the industry's first 60-nanometer design rule 8-gigabit NAND Flash memory chip used for data storage The 8Gb NAND flash memory will allow storage of up to 16 hours of DVD quality video.
Primary Storage • ROM (Read Only Memory)
Secondary Storage • Magnetic Tape • DDS Tape
Secondary Storage • Magnetic Tape
Secondary Storage • Magnetic Disk • Hitachi Deskstar 7K400Serial ATA RAID 0 Size: 800GB Seek time: 8.5ms Rotational Speed: 7200 RPM Buffer Cache: 8 MB
Secondary Storage • Magnetic Disk • Western Digital RaptorSerial ATA RAID 0 Size: 148 GB Seek time: 4.5ms Rotational Speed: 10000 RPM Buffer Cache: 16 MB
Secondary Storage • Magnetic Disk
Secondary Storage • Magnetic Disk • Transcend 1.8" Portable Hard Drive Capacity: 40 GB Size:3.7 x 2.8 x 0.6 inches Weight: 6.0 ounce
Secondary Storage • Magnetic Disk • Floppy
Secondary Storage • Optical Disk
Secondary Storage • Optical Disk • CD-ROM • CD-R (WORM) • Magnet Optical • DVD-ROM • DVD-R • DVD-RAM • DVD-RW • DVD+RW
Storage Device Characteristics • Different device are used for differentstorage purposes because there is no single storage device that is best in all the primary characteristics that distinguish storage device, which include…
1. SPEED • Time required to read or write a bit, byte, or larger unit of data. • Cost increases as speed increase.
2. VOLATILITY • Ability to hold data indefinitely, particularly in the absence of external power. • For device of similar type, cost decrease as volatility increase.
3. ACCESS METHOD • Can be serial, random, or parallel; parallel device are also serial or random access. • Serial is least expensive; random is more expensive than serial; parallel access is more expensive than on-parallel access.
4. PORTABILITY • Ability to easily remove and reinstall the storage media from the device or the device from the computer. • For device of similar type, portability increase cost; if all the there characteristics are held constant.
5. COST & CAPACITY • Maximum data quantity held by the device or storage medium. • Cost usually increase in direct proportion to capacity.