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Hardisk Pertama

Hardisk Pertama. Harddisk Pertama di Dunia Seberat 1 Ton ! diluncurkan IBM pada September 1956 Kapasitas penyimpanan Sebesar 5 Mb. 250 MB hard disk drive (1979). 2.52 GB ( size of a refrigerator) 550 pounds (250 kg). 1GB memory of 20 years ago and 1GB of now. Perkembangan Hard disk.

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Hardisk Pertama

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  1. Hardisk Pertama • Harddisk Pertama di Dunia Seberat 1 Ton ! • diluncurkan IBM pada September 1956 • Kapasitas penyimpanan Sebesar 5 Mb

  2. 250 MB hard disk drive (1979)

  3. 2.52 GB (size of a refrigerator)550 pounds (250 kg)

  4. 1GB memory of 20 years ago and 1GB of now

  5. Perkembangan Hard disk

  6. Track & Sector

  7. Hard Disk Drive (HDD) Components • Electromechanical • Rotating disks • Arm assembly • Electronics • Disk controller • Cache • Interface controller

  8. HDD Organization Arm Assembly Spindle Cylinder Head Arm Platter Track

  9. Materials that Cause a Head Crash

  10. Disk Medium Materials • Aluminum with a deposit of magnetic material • Some disks also use glass platters • Eg. Newer IBM/Hitachi products • Better surface uniformity and stiffness but harder to deposit magnetic material • Anti-Ferromagnetically Coupled media • Uses two magnetic layers of opposite polarity to reinforce the orientation. • Can provide higher densities but at higher manufacturing complexity

  11. A Magnetic ‘Bit’ • Bit-cell composed of magnetic grains • 50-100 grains/bit • ‘0’ • Region of grains of uniform magnetic polarity • ‘1’ • Boundary between regions of opposite magnetization Source: http://www.hitachigst.com/hdd/research/storage/pm/index.html

  12. Perpendicular Recording: Soft underlayer (mirrors) write field and allows domains to be closer. For Reading Longitudinal Recording: Magnetic domains oriented in the direction in which head travels For Writing

  13. Longitudal & Perpendicular

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