Data Storage Data Storage TechnologyTechnology

Present byPresent by

Harry MagarangHarry Magarang

Primary StoragePrimary Storage

V.S.V.S.

Secondary StorageSecondary Storage

What is the characteristics of What is the characteristics of primary and secondary primary and secondary storage?storage?

Instruction and data currently Instruction and data currently executing programs flow to and from executing programs flow to and from primary storage.primary storage.

Secondary storage hold programs Secondary storage hold programs that are not currently being that are not currently being executing, as well as group of data executing, as well as group of data item that are too large to fit in item that are too large to fit in primary storage.primary storage.

Primary StoragePrimary Storage

Static RAM (SRAM)Static RAM (SRAM)

Primary StoragePrimary Storage

Dynamic RAM (DRAM)Dynamic RAM (DRAM) 3GB Dual Channel DDR2 Registered 3GB Dual Channel DDR2 Registered

ECC SDRAM at 400MHzECC SDRAM at 400MHz

Primary StoragePrimary Storage

Flash RAMFlash RAM

Primary StoragePrimary Storage Flash RAMFlash 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 StoragePrimary Storage

ROM (Read Only Memory)ROM (Read Only Memory)

Secondary StorageSecondary Storage Magnetic TapeMagnetic Tape

DDS TapeDDS Tape

Secondary StorageSecondary Storage Magnetic TapeMagnetic Tape

Secondary StorageSecondary Storage

Magnetic DiskMagnetic Disk Hitachi Deskstar 7K400Hitachi Deskstar 7K400 Serial Serial

ATA RAID 0ATA RAID 0 Size: 800GB

Seek time: 8.5ms

Rotational Speed: 7200 RPM

Buffer Cache: 8 MB

Secondary StorageSecondary Storage

Magnetic DiskMagnetic Disk Western Digital RaptorWestern Digital Raptor Serial ATA Serial ATA

RAID 0RAID 0 Size: 148 GB

Seek time: 4.5ms

Rotational Speed: 10000 RPM

Buffer Cache: 16 MB

Secondary StorageSecondary Storage

Magnetic Disk Magnetic Disk

Secondary StorageSecondary Storage

Magnetic DiskMagnetic Disk Transcend 1.8" Portable Hard DriveTranscend 1.8" Portable Hard Drive

Capacity: 40 GB

Size:3.7 x 2.8 x 0.6 inches

Weight: 6.0 ounce

Secondary StorageSecondary Storage

Magnetic DiskMagnetic Disk FloppyFloppy

Secondary StorageSecondary Storage

Optical DiskOptical Disk

Secondary StorageSecondary Storage

Optical DiskOptical Disk CD-ROMCD-ROM CD-R (WORM)CD-R (WORM) Magnet OpticalMagnet Optical DVD-ROMDVD-ROM DVD-RDVD-R DVD-RAMDVD-RAM DVD-RWDVD-RW DVD+RWDVD+RW

Storage Device Storage Device CharacteristicsCharacteristics

Different device are used for differentDifferent device are used for different

storage purposes because there is no storage purposes because there is no

single storage device that is best in all single storage device that is best in all the the

primary characteristics that distinguish primary characteristics that distinguish

storage device, which include…storage device, which include…

1. SPEED1. SPEED

Time required to read or write a Time required to read or write a bit, byte, bit, byte,

or larger unit of data.or larger unit of data.

Cost increases as speed increase.Cost increases as speed increase.

2. VOLATILITY2. VOLATILITY

Ability to hold data indefinitely, Ability to hold data indefinitely, particularly particularly

in the absence of external power.in the absence of external power.

For device of similar type, cost decrease For device of similar type, cost decrease

as volatility increase.as volatility increase.

3. ACCESS METHOD3. ACCESS METHOD

Can be serial, random, or parallel; parallel Can be serial, random, or parallel; parallel

device are also serial or random access.device are also serial or random access.

Serial is least expensive; random is more Serial is least expensive; random is more

expensive than serial; parallel access is expensive than serial; parallel access is

more expensive than on-parallel access.more expensive than on-parallel access.

4. PORTABILITY4. PORTABILITY Ability to easily remove and reinstall the Ability to easily remove and reinstall the

storage media from the device or the storage media from the device or the

device from the computer.device from the computer.

For device of similar type, portability For device of similar type, portability

increase cost; if all the there characteristics increase cost; if all the there characteristics

are held constant.are held constant.

5. COST & CAPACITY5. COST & CAPACITY

Maximum data quantity held by Maximum data quantity held by the the

device or storage medium.device or storage medium.

Cost usually increase in direct Cost usually increase in direct

proportion to capacity.proportion to capacity.