Presentation on computer data storage

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Presentation on computer data storage

  1. 1. By Ayush Garg
  2. 2. 1. 2. 3. 4. 5. Primary Memory Secondary Memory Summary Questions & Answers Thank You
  3. 3. Only one directly accessible to the CPU. Used to hold the temporarily data during the execution. Other names are – Main Memory or Internal Memory Types of Primary memory– 1. 2. 3. 4. 1. 2. 3. 5. 6. RAM – Random Access Memory ROM – Read Only Memory PROM/EPROM - Programmable ROM It has a Limited Capacity Information is retained only when it is Actively Rehearsed.
  4. 4. s 1. 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 files and directories. 4. Also Providing Additional Information METADATA describing the owner of the certain file.
  5. 5.  Allows Stored Data to Be Accessed Quickly In Any Random Order It Has Taken The Form Of Integrated Circuits  It is Associated With Volatile Types Of Memory  Where 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
  6. 6.  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. 7.  HARD DISKS  PERFORMANCE ENHANCEMENTS  OPTICAL DISKS  SPECIALISED MEDIA  FLOPPY DISKS
  8. 8.  Portable And Removable  Flat Circular Mylar Media  Magnetic Charge on Metal Oxide Film Coating  Standard 2 HD 1.44 MB  Parts  Tracks  Sectors
  9. 9.  Floppy disk cartridges  Zip Disks  250 MB  Super Disks  120 MB  HiFD disks  200 MB
  10. 10.  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
  11. 11.  Inside system unit  Non-removable or portable  Great capacity  Over 100 Gigabytes  Fast access speed
  12. 12.  Portable, removable  Complement internal hard drive  JAZ from Iomega  SPARQ from SyQuest  PC Card Hard Disks  Laptop computers
  13. 13.  Used in mainframes  Removable  Resemble stack of vinyl records  Multiple read/write heads  Massive storage capacity  Fast access time
  14. 14.  Improving performance of hard disks  Disk caching  Redundant Arrays of Inexpensive Disks (RAID)  File compression and decompression
  15. 15.  Very large capacity  Up to 17 gigabytes  Use reflected light projected by a laser  Lands and Pits represent 1’s and 0’s  Formats  Compact Disk (CD)  Digital Versatile Disk (DVD)  Data Play
  16. 16.  Widely used format today  Can store from 650 MB to 1 GB  Rotational speed = data transfer time  Types of CDs  CD-ROM  CD-R  CD-RW
  17. 17.  Digital Versatile Disk  Rapidly replacing CDs  Higher capacity  17 times the capacity of a CD
  18. 18.  DVD types  DVD-ROM  Read only memory  DVD-R  Recordable  DVD-RAM or DVD-RW  Competing rewritable formats
  19. 19.  Optical write-once format  Similar to CD-R  Size of a quarter  Used for special applications  Storing digital photographs  Storing music for portable players
  20. 20.  Sequential access  Commonly used for backing-up data  Very large capacity  Types of magnetic tape  Tape cartridges  Magnetic tape reels
  21. 21.  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
  22. 22.  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
  23. 23.  Blue laser light optical devices  Aimed more accurately  Can increase storage capacity to 27 GB per standard optical disk  New players will likely play both

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