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ms office

  1. 1. welcome<br />Presented by---<br />Saubhagya surya<br />
  2. 2. PRESENTATION UPON HARD DISK DRIVE<br />
  3. 3. HARD DISK DRIVE<br />A hard disk is part of a unit, often called a "disk drive," "hard drive," or "hard disk drive," that stores and provides relatively quick access to large amounts of data on an electromagnetically charged surface or set of surfaces. Today's computers typically come with a hard disk that contains several billion bytes (gigabytes) of storage.<br />
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  6. 6. Basic component of hard disk drive<br />Disk platters<br />Read/write heads<br />Head actuator<br />Spindle motor<br />Logic board <br />Cables & connectors<br />Circuit cable<br />Shock Mount<br />Actuator<br />D.C. power input<br />
  7. 7. Hard Disk Drive (HDD) Components<br />Electromechanical<br />01-Rotating disks<br />02-Arm assembly<br />Electronics<br />01-Disk controller<br />02-Cache<br />03-Interface controller<br />
  8. 8. HDD Organization<br />Arm<br /> Assembly<br />Spindle<br />Arm<br />Cylinder<br />Platter<br />Track<br />
  9. 9. PATA<br />Successor to ST-412/506/ESDI by integrating the disk controller completely onto the device. Incapable of concurrent operations.<br />
  10. 10. SATA<br />Modification of ATA, uses serial communication instead of parallel<br />
  11. 11. What Is A Hybrid Hard Disk (H-HDD)?<br />All disk have a <br />Dram cache<br />DRAM<br />Cache<br />A HDD also has a non –volatile cache<br />NV<br />Cache<br />
  12. 12. Writing<br />Process of transferring items from memory to storage media<br />Reading<br />Process of transferring items form storage media to memory<br />Hardware that<br />Records<br />Data<br />Creates output<br />Functionas source of input<br />
  13. 13. A Magnetic ‘Bit’<br />Bit-cell composed of magnetic grains<br />- 50-100 grains/bit<br />‘0’<br />-Region of grains of uniform magnetic polarity<br />‘1’<br />-Boundary between regions of opposite magnetization<br />
  14. 14. UNIT Storage capacity<br /> Kilobyte (KB) 1 Thousand<br /> Megabyte(MB) 1 Million<br /> Gigabyte(GB) 1 Billion<br /> Petabyte(PB) 1 Quadrillion<br /> Exabyte(EB) 1 Quintillion<br /> Zettabyte(ZB) 1 Sextillion<br /> Yottabyte(YB) 1 Septillion<br />
  15. 15. Performance: What do users see?<br />Slow state transitions<br /> a. Boot, hibernate, resume<br /> B. Increased disk access under memory pressure<br /> a. Reduces performance<br />C. Program launch can be slow<br /> a. Cold memory<br /> b. Competing I/O<br />
  16. 16. Thanks For Watching!<br />

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