12-42. 12-43. 12-44. 12-45. Which of the following actions does the format program take while performing a low-level format on a fixed disk system? 1. Checks for bad tracks and marks them with a checksum  code 2. Writes the sectors and tracks on the disk 3. Both 1 and 2 above 4. Divides the disk into DOS partitions Write precompensation helps eliminate data errors by what method, if any? 1. 2. 3. 4. Increasing the number of bytes per sector as the heads move toward the inner tracks of the disk Decreasing the number of bytes per sector as the heads move toward the inner tracks of the disk Changing the spacing of the magnetic fields as the heads move toward the inner tracks of the disk None; write precompensation does not help eliminate data errors Decreasing the amount of current used to write data on the inner tracks of the disk is known as 1.  write  precompensation 2. reduced write current 3. low-level disk format 4.  disk  partitioning Write precompensation and reduced write current are necessary for which of the following reasons? 1. 2. 3. 4. The inner tracks of the disk are larger than the outer tracks The inner tracks of the disk are smaller than the outer tracks The disk spins faster when reading the inner tracks The disk spins slower when reading the inner tracks 12-46. 12-47. 12-48. 12-49. 12-50. Runnmg the DOS FDISK program on a fixed disk in a personal computer performs which of the following functions? 1. Prepares the DOS boot sector on the disk 2. Creates the file allocation table on the disk 3. Writes the sectors on the disk 4. Creates the root directory When you erase a file on a disk in a personal computer, which of the following operations does DOS perform? 1. 2. 3. 4. Finds the file and writes all ZEROS to the sectors on the disk that the file occupied Finds the file and writes all ONES to the sectors on the disk that the file occupied Changes the code in the FAT to indicate that the clusters the file occupied are available for data storage Changes the code in the root directory to indicate that the file is erased A virus may only infect your personal computer if it loaded into which of the following types of files? 1. 2. 3. 4. A .COM or .EXE file only A data file only The master boot record only Any file loaded when doing a low-level disk format Which of the following viruses embeds itself into other programs and may contain other types of. viruses? 1.  Worm 2. Trojan horse 3. Logic bomb Which of the following viruses tries to endlessly copy itself on a fixed disk, tying up the computer and eventually overloading the disk? 1.  Worm 2.  Trojan  horse 3.  Logic  bomb 86