Magnetic Tape

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

1. Magnetic Tape Betsy Chacko HOD & Assistant Professor Department of Computer Applications St. Mary’s College Thrissur

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. 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 Contents Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur

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 Contents Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur

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 Contents Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur

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 Contents Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur

7. Storage Organization Contents Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur

8. Magnetic Tape: Type and Capacity Contents Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur

9. Advantages Contents Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur

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 /in 2 20x Greater Density Than Conventional Technology for Supporting High-Capacity 330 TB Recording Contents Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur

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. Contents Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur

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. Contents Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur

13. Magnetic Tape : Today Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur

14. Contents 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. 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 Contents Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur

16. Computer Fundamentals: Pradeep K. Sinha & Priti Sinha https://arstechnica.com/information-technology https://www.amazon.com References Contents Secondary Storage Devices,Betsy Chacko,St.Mary's College, Thrissur

17. Thank You [email protected]