presentation on computer data storage v1.0
TRANSCRIPT
-
7/29/2019 Presentation on Computer Data Storage V1.0
1/28
ByAyush Garg
And
Saurabh Tyagi
-
7/29/2019 Presentation on Computer Data Storage V1.0
2/28
1. Primary Memory
2. Secondary Memory
3. Summary
4. Questions & Answers5. Thank You
-
7/29/2019 Presentation on Computer Data Storage V1.0
3/28
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.
-
7/29/2019 Presentation on Computer Data Storage V1.0
4/28
-
7/29/2019 Presentation on Computer Data Storage V1.0
5/28
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.
-
7/29/2019 Presentation on Computer Data Storage V1.0
6/28
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
-
7/29/2019 Presentation on Computer Data Storage V1.0
7/28
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
-
7/29/2019 Presentation on Computer Data Storage V1.0
8/28
HARD DISKS
PERFORMANCE ENHANCEMENTS
OPTICAL DISKS
SPECIALISED MEDIA
FLOPPY DISKS
-
7/29/2019 Presentation on Computer Data Storage V1.0
9/28
Portable And Removable
Flat Circular Mylar Media
Magnetic Charge on Metal OxideFilm Coating
Standard HD MB
Parts
Tracks Sectors
-
7/29/2019 Presentation on Computer Data Storage V1.0
10/28
Floppy disk cartridges
Zip Disks
250 MB
Super Disks
120 MB
HiFD disks
200 MB
-
7/29/2019 Presentation on Computer Data Storage V1.0
11/28
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
-
7/29/2019 Presentation on Computer Data Storage V1.0
12/28
-
7/29/2019 Presentation on Computer Data Storage V1.0
13/28
Inside system unit
Non-removable or portable Great capacity
Over 100 Gigabytes
Fast access speed
-
7/29/2019 Presentation on Computer Data Storage V1.0
14/28
Portable, removable
Complement internal
hard driveJAZ from Iomega
SPARQ from
SyQuest PC Card Hard Disks
Laptop computers
-
7/29/2019 Presentation on Computer Data Storage V1.0
15/28
Used in mainframes
Removable
Resemble stack of vinylrecords
Multiple read/write heads
Massive storage capacity
Fast access time
-
7/29/2019 Presentation on Computer Data Storage V1.0
16/28
Improving performance of hard disks Disk caching
RedundantArrays ofInexpensive Disks (RAID)
File compression and decompression
-
7/29/2019 Presentation on Computer Data Storage V1.0
17/28
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
-
7/29/2019 Presentation on Computer Data Storage V1.0
18/28
Widely used format today
Can store from 650 MB to 1GB
Rotational speed = datatransfer time
Types of CDs
CD-ROM CD-R CD-RW
-
7/29/2019 Presentation on Computer Data Storage V1.0
19/28
Digital Versatile Disk
Rapidly replacing CDs
Higher capacity
17 times the capacity
of a CD
-
7/29/2019 Presentation on Computer Data Storage V1.0
20/28
DVD types
DVD-ROM
Read only memory DVD-R
Recordable
DVD-RAM or DVD-RW
Competing rewritable formats
-
7/29/2019 Presentation on Computer Data Storage V1.0
21/28
Optical write-once format
Similar to CD-R
Size of a quarter
Used for special
applications
Storing digital
photographs Storing music for
portable players
-
7/29/2019 Presentation on Computer Data Storage V1.0
22/28
Sequential access
Commonly used for backing-up data
Very large capacity
Types of magnetic tape
Tape cartridges
Magnetic tape reels
-
7/29/2019 Presentation on Computer Data Storage V1.0
23/28
-
7/29/2019 Presentation on Computer Data Storage V1.0
24/28
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
-
7/29/2019 Presentation on Computer Data Storage V1.0
25/28
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
-
7/29/2019 Presentation on Computer Data Storage V1.0
26/28
Blue laser light opticaldevices
Aimed more accurately
Can increase storagecapacity to 27 GB perstandard optical disk
New players will likely playboth
-
7/29/2019 Presentation on Computer Data Storage V1.0
27/28
-
7/29/2019 Presentation on Computer Data Storage V1.0
28/28