Data Storage Technology

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Presentation transcript:

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. 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 Samsung Electronics 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 7K400 Serial ATA RAID 0 Size: 800GB Seek time: 8.5ms Rotational Speed: 7200 RPM Buffer Cache: 8 MB

Secondary Storage Magnetic Disk Western Digital Raptor Serial 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 different storage 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.