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Magnetic Tape
Betsy Chacko
HOD & Assistant Professor
Department of Computer Applications
St. Mary’s College Thrissur
Contents
• Primary Storage Vs. Secondary Storage
• Sequential and Direct Access Devices
• Magnetic Tapes
• Storage Organiz...
Primary Memory
• Mandatory
• Volatile
• Expensive
• Limited Capacity
Secondary Memory
(External Memory or Auxiliary Storag...
Sequential and Direct Access Devices
Sequential
• Sequencing through
locations
• Access time varies
according to location
...
Magnetic Tapes
• Sequential
• Popular for large data sets
• Plastic ribbon usually half inch or quarter inch wide
and 50 t...
• Continuous medium
• Record data serially
• No addressing
Inter Record Gaps – Separates recors by blank spaces
Inter Bloc...
Storage Organization
Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
Magnetic Tape: Type and Capacity
Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
Advantages
Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
Magnetic Tape : Today
• Modern magnetic tape is packaged in cartridges and cassettes
• Single palm-sized cartridge
• Sony ...
Technology Introduced
New technologies used for a dramatic increase in areal density
1. an improved built-in lubricant lay...
4. A set of advanced servo control technologies that when combined
enable head positioning with an accuracy of better than...
Magnetic Tape : Today
Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
Future of Data Storage
Magnetic Tape
Why?
Disk drives are reaching their limits, but magnetic tape
just gets better and be...
Tape storage is currently the most secure, energy
efficient and cost-effective solution for storing
enormous amounts of ba...
1. Computer Fundamentals: Pradeep K. Sinha &
Priti Sinha
2. https://arstechnica.com/information-technology
3. https://www....
Magnetic Tape
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Magnetic Tape

Computer Application-Magnetic Tape
Primary Storage Vs. Secondary Storage
Sequential and Direct Access Devices,Storage Organization

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Magnetic Tape

  1. 1. Magnetic Tape Betsy Chacko HOD & Assistant Professor Department of Computer Applications St. Mary’s College Thrissur
  2. 2. Contents • Primary Storage Vs. Secondary Storage • Sequential and Direct Access Devices • Magnetic Tapes • Storage Organization • Type and Capacity • Advantages • Magnetic Tape : Today • New Technologies Introduced • Future of Data Storage • Conclusion Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
  3. 3. Primary Memory • Mandatory • Volatile • Expensive • Limited Capacity Secondary Memory (External Memory or Auxiliary Storage) • Huge volume • Non Volatile • Less Expensive Primary Storage Vs. Secondary Storage Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
  4. 4. Sequential and Direct Access Devices Sequential • Sequencing through locations • Access time varies according to location • Eg : Magnetic Tape Random • Direct access storage device • Access any location at random • Approximately equal access time • Eg: Magnetic Disk, Optical Disk Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
  5. 5. Magnetic Tapes • Sequential • Popular for large data sets • Plastic ribbon usually half inch or quarter inch wide and 50 to 2400 feet long • Surface coated with iron oxide or chromium dioxide • Record data by magnetization • Tape ribbon stores in reels • Can store and erase data • Can read the data several times Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
  6. 6. • Continuous medium • Record data serially • No addressing Inter Record Gaps – Separates recors by blank spaces Inter Block Gaps – Separates blocks by blank spaces Magnetic Tapes Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
  7. 7. Storage Organization Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
  8. 8. Magnetic Tape: Type and Capacity Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
  9. 9. Advantages Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
  10. 10. Magnetic Tape : Today • Modern magnetic tape is packaged in cartridges and cassettes • Single palm-sized cartridge • Sony Develops Magnetic Tape Storage Technology with the Industry's Highest Recording Areal Density of 201 Gb/in2 • 20x Greater Density Than Conventional Technologyfor Supporting High-Capacity 330 TB Recording Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
  11. 11. Technology Introduced New technologies used for a dramatic increase in areal density 1. an improved built-in lubricant layer a new type of magnetic layer. 2. sputter deposition sputtering—it produces magnetic tape with magnetic grains that are just a few nanometres across, rather than tens or hundreds of nanometres in the case of commercially available tape. 3. Innovative signal-processing algorithms for the data channel based on noise-predictive detection principles, which enable reliable operation at a linear density of 818,000 bits per inch with an ultra- narrow 48nm wide tunneling magneto- resistive (TMR) reader. Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
  12. 12. 4. A set of advanced servo control technologies that when combined enable head positioning with an accuracy of better than 7 nanometers. This combined with a 48nm wide (TMR) hard disk drive read head enables a track density of 246,200 tracks per inch, a 13-fold increase over a state of the art TS1155 drive. 5. A novel low friction tape head technology that permits the use of very smooth tape media Technology Introduced cont. Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
  13. 13. Magnetic Tape : Today Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
  14. 14. Future of Data Storage Magnetic Tape Why? Disk drives are reaching their limits, but magnetic tape just gets better and better........... Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
  15. 15. Tape storage is currently the most secure, energy efficient and cost-effective solution for storing enormous amounts of back-up and archival data, as well as for new applications such as Big Data and cloud computing. Conclusion Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur
  16. 16. 1. Computer Fundamentals: Pradeep K. Sinha & Priti Sinha 2. https://arstechnica.com/information-technology 3. https://www.amazon.com References Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur

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