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Hard drive: Quiz

  

Question 1: What does the following picture show?

  Diagram of a computer hard disk drive
  A cross section of the magnetic surface in action. In this case the binary data is encoded using frequency modulation.

Question 2: What does the following picture show?

  Close-up of a hard disk head resting on a disk platter. A reflection of the head and its suspension is visible on the mirror-like disk.
  Six hard drives with 8″, 5.25″, 3.5″, 2.5″, 1.8″, and 1″ disks, partially disassembled to show platters and read-write heads, with a ruler showing inches.
  Microphotograph of an older generation hard disk head and slider (1990s). The size of the front face (which is the "trailing face" of the slider) is about 0.3 mm × 1.0 mm. It is the location of the actual 'head' (magnetic sensors). The non-visible bottom face of the slider is about 1.0 mm × 1.25 mm (so-called "nano" size) and faces the platter. It contains the lithographically micro-machined air bearing surface (ABS) that allows the slider to fly in a highly controlled fashion. One functional part of the head is the round, orange structure visible in the middle - the lithographically defined copper coil of the write transducer. Also note the electric connections by wires bonded to gold-plated pads.

Question 3: What does the following picture show?

  Microphotograph of an older generation hard disk head and slider (1990s). The size of the front face (which is the "trailing face" of the slider) is about 0.3 mm × 1.0 mm. It is the location of the actual 'head' (magnetic sensors). The non-visible bottom face of the slider is about 1.0 mm × 1.25 mm (so-called "nano" size) and faces the platter. It contains the lithographically micro-machined air bearing surface (ABS) that allows the slider to fly in a highly controlled fashion. One functional part of the head is the round, orange structure visible in the middle - the lithographically defined copper coil of the write transducer. Also note the electric connections by wires bonded to gold-plated pads.
  A Western Digital 3.5 inch 250 GB SATA HDD; this specific model features both SATA and Molex power inputs
  A cross section of the magnetic surface in action. In this case the binary data is encoded using frequency modulation.

Question 4: What does the following picture show?

  Close-up of a hard disk head resting on a disk platter. A reflection of the head and its suspension is visible on the mirror-like disk.
  An IBM HDD head resting on a disk platter. Since the drive is not in operation, the head is simply pressed against the disk by the suspension.
  A read/write head from a circa-1998 Fujitsu 3.5-inch hard disk. The area pictured is approximately 2.0 mm x 3.0mm.
  Inner view of a 1998 Seagate hard disk drive which used Parallel ATA interface

Question 5: What does the following picture show?

  Seagate hard disk drives being manufactured in a factory in Wuxi, China
  Close-up of a hard disk head resting on a disk platter. A reflection of the head and its suspension is visible on the mirror-like disk.
  Diagram of a computer hard disk drive
  Diagram of a computer hard disk drive

Question 6: What does the following picture show?

  A read/write head from a circa-1998 Fujitsu 3.5-inch hard disk. The area pictured is approximately 2.0 mm x 3.0mm.
  PC hard disk drive capacity (in GB) over time. The vertical axis is logarithmic, so the fit line corresponds to exponential growth.
  A Western Digital 3.5 inch 250 GB SATA HDD; this specific model features both SATA and Molex power inputs
  A read/write head from a circa-1998 Fujitsu 3.5-inch hard disk. The area pictured is approximately 2.0 mm x 3.0mm.

Question 7: What does the following picture show?

  Microphotograph of an older generation hard disk head and slider (1990s). The size of the front face (which is the "trailing face" of the slider) is about 0.3 mm × 1.0 mm. It is the location of the actual 'head' (magnetic sensors). The non-visible bottom face of the slider is about 1.0 mm × 1.25 mm (so-called "nano" size) and faces the platter. It contains the lithographically micro-machined air bearing surface (ABS) that allows the slider to fly in a highly controlled fashion. One functional part of the head is the round, orange structure visible in the middle - the lithographically defined copper coil of the write transducer. Also note the electric connections by wires bonded to gold-plated pads.
  Diagram of a computer hard disk drive

Question 8: What does the following picture show?

  A Western Digital 3.5 inch 250 GB SATA HDD; this specific model features both SATA and Molex power inputs
  PC hard disk drive capacity (in GB) over time. The vertical axis is logarithmic, so the fit line corresponds to exponential growth.
  A cross section of the magnetic surface in action. In this case the binary data is encoded using frequency modulation.
  A disassembled and labeled 1997 hard drive. All major components were placed on a mirror, which created the symmetrical reflections.

Question 9: What does the following picture show?

  Close-up of a hard disk head resting on a disk platter. A reflection of the head and its suspension is visible on the mirror-like disk.
  Diagram of a computer hard disk drive
  Inner view of a 1998 Seagate hard disk drive which used Parallel ATA interface
  A cross section of the magnetic surface in action. In this case the binary data is encoded using frequency modulation.
















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