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A1. 8 inch, 5 1/4 inches, 3 1/2 inches.
A2. Double-sided.
A3. Single-density, double-density, and high-density.
A4. 1,200,000 bytes or 1.2 megabytes.
A5. The disks can hold 96 tracks per inch.
A6. Soft sectoring.
A7. Disk side number, track number, and sector number.
A8. Dust and other contaminates can get on the recording surface through the read/write hole.
A9. Magnetic fields can destroy the data on a disk.
A10. Degauss the disk and then reformat it. Reformat the disk.
A11. 3-1/2 inches, 5-1/4 inches, and 14 inches.
A12. (1) Cylinder method and (2) sector method.
A13. Sector method.
A14. Cylinder number. Recording surface number. Record number.
A15. Head-crash.
A16. 30-60 percent relative humidity. 70-80 degrees Farenheit.
A17. Reformat the disk.
A18. Frequency modulation (FM). Modified frequency modulation (MFM). Run length limited (RLL).
A19. Frequency-modulation encoding.
A20. Run length-limited (RLL) encoding.
A21. Drive motor/spindle assembly. Head arm assembly. Actuator arm assembly. Drive electronics circuit board.
A22. 600 RPM.

A23. Two read heads and two write heads.
A24. Actuator arm assembly.
A25. Drive electronics circuit board.
A26. Rotates the hard disk platters. Writes data to and reads data from the disk platters.
A27. Voice coil servo.
A28. They are not sealed units, and they use flimsy plastic disks with an oxide coating that wears off and sticks to the heads.
A29. A cloth or fiber cleaning disk. A bottle of cleaning solution.
A30. Once a month.
A31. Cleaning with a special cleaning disk. Cleaning air filters. Cleaning spindles, rails, and slides. Cleaning and buffing read/write heads.
A32. Spins the disk at the correct speed. Moves the heads across the recording surface. Tells the write/read heads when to write data and when to read it.
A33. Formats and writes incoming data from the interface electronics onto the disk. Reads data off the disk, formats it, and sends it to the interface electronics for output. Performs the initial disk formatting.
A34. Receives control signals from the host computer and sends them to the control electronics or write/read electronics. Receives data from the write/read electronics and outputs it to the host computer. Converts incoming and outgoing data from parallel to serial, and vice versa, if needed.
A35. NTDS interface.
A36. ST-506/412 interface.
A37. The host computer asks for data by specifying a logical sector number. The SCSI translates the sector number into the actual disk location.
A38. Integrated drive electronics (IDE).

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