Presentation on Computer Data Storage V1.0

7/29/2019 Presentation on Computer Data Storage V1.0

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ByAyush Garg

And

Saurabh Tyagi


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1. Primary Memory

2. Secondary Memory

3. Summary

4. Questions & Answers5. Thank You


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1. Only one directly accessible to the CPU.

2. Used to hold the temporarily data during the execution.

3. Other names are Main Memory or Internal Memory

4. Types of Primary memory1. RAM Random Access Memory

2. ROM Read Only Memory

3. PROM/EPROM - Programmable ROM

5. It has a Limited Capacity6. Information is retained only when it is Actively

Rehearsed.


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s1. Secondary Memory also known as EXTERNAL

MEMORY or AUXILIARY MEMORY.

2. Often formatted according to a File Systems Format.

3. Provide abstraction necessary to organize data into filesand directories.

4. Also Providing Additional Information METADATAdescribing the owner of the certain file.


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Allows Stored Data to Be Accessed Quickly In AnyRandom Order

It Has Taken The Form Of Integrated Circuits It is Associated With Volatile Types Of MemoryWhere The Stored Data Is LOST If The Power Is

REMOVED Any Location In The Device Can Be Selected At Random,

Access To The Information Stored Is DIRECT


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A Class Of Data Storage Device It Reads the Data In Sequence Very Much In Contrast With RAM (where Data Can Be

Accessed In Any Order)

They Are Usually A Form Of Magnetic Devices Access Can STILL Be Made To Arbitrary Locations Typically Used For Secondary Storage It Has High Density And Cost As Compared To RAM As Well As Resistance to Wear and Non-Volatility

EXAMPLE

Hard Disks, CD- ROMS And Magnetic Tapes


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HARD DISKS

PERFORMANCE ENHANCEMENTS

OPTICAL DISKS

SPECIALISED MEDIA

FLOPPY DISKS


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Portable And Removable

Flat Circular Mylar Media

Magnetic Charge on Metal OxideFilm Coating

Standard HD MB

Parts

Tracks Sectors


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Floppy disk cartridges

Zip Disks

250 MB

Super Disks

120 MB

HiFD disks

200 MB


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Metallic disks

Fast retrieval, greater capacity

Read/write heads ride cushion of air .000001

thick

Three types

Internal hard disk

Hard-disk cartridge

Hard-disk pack


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Inside system unit

Non-removable or portable Great capacity

Over 100 Gigabytes

Fast access speed


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Portable, removable

Complement internal

hard driveJAZ from Iomega

SPARQ from

SyQuest PC Card Hard Disks

Laptop computers


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Used in mainframes

Removable

Resemble stack of vinylrecords

Multiple read/write heads

Massive storage capacity

Fast access time


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Improving performance of hard disks Disk caching

RedundantArrays ofInexpensive Disks (RAID)

File compression and decompression


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Very large capacity

Up to 17 gigabytes

Use reflected light

projected by a laser Lands and Pits represent 1s

and 0s

Formats

Compact Disk (CD) Digital Versatile Disk

(DVD)

Data Play


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Widely used format today

Can store from 650 MB to 1GB

Rotational speed = datatransfer time

Types of CDs

CD-ROM CD-R CD-RW


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Digital Versatile Disk

Rapidly replacing CDs

Higher capacity

17 times the capacity

of a CD


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DVD types

DVD-ROM

Read only memory DVD-R

Recordable

DVD-RAM or DVD-RW

Competing rewritable formats


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Optical write-once format

Similar to CD-R

Size of a quarter

Used for special

applications

Storing digital

photographs Storing music for

portable players


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Sequential access

Commonly used for backing-up data

Very large capacity

Types of magnetic tape

Tape cartridges

Magnetic tape reels


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Tape cartridges

Backup tape for microcomputer

Capacities range from 120 MB to 5 GB Digital audio tape (DAT)

Tape reels

Minicomputer and mainframe

1/2 inch wide and 1/2 mile long

Stores 1600 to 6400 cpi


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Internet hard drive Free or low-cost storage on the Web

Access information from any location

Access time is greater

Solid-state storage

No moving parts

Flash memory cards


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Blue laser light opticaldevices

Aimed more accurately

Can increase storagecapacity to 27 GB perstandard optical disk

New players will likely playboth


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Presentation on Computer Data Storage V1.0

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