gnetic disk.
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Create a definition for magnetic disk.
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- Explain what you mean by "buffer overflow."Find out disk capacity bytes ?Please refer to this textbook: “A. Silberschatz, P. B. Galvin and G. Gagne, “Operating System Principles,”7th Edition, John Wiley & Sons Inc., 2006.” And answer the following questions: Question12: Which disk schedualing algorithm is most vulnerable to starvation (a) SCAN. (b) Shortest Seek Time First (SSTF). (c) LOOK. (d) First Come, First Served (FCFS)
- Suppose the RAM for a certain computer has 256M words, where each word is 16 bits long. a. What is the capacity of this memory expressed in bytes? b. If this RAM is byte addressable, how many bits must an address contain? c. If this RAM is word addressable, how many bits must an address contain?Suppose a computer using direct mapped cache has 224 bytes of byte- addressable main memory and a cache size of 64K bytes, and each cache block contains 32 bytes. (Note: 64K = 26 * 210) a) How many blocks of main memory are there? b) What is the format of a memory address as seen by cache, i.e., what are the sizes of the tag, block, and offset fields?Suppose a Unix Inode has 10 direct disk block pointers, one single indirect block pointer, one double indirect block pointer, and one triple indirect block pointer. For convenience, each index table has 256 = 28 entries and each block has 1K = 210 bytes. What is the maximum size of a Unix file in Kbytes?
- What is Disk Geometry ?Assume an inode has 14 direct pointers and two pointers to indirect blocks. The indirect blocks are 4KB big, and pointers are 4-bytes in size. How many data blocks can be accommodated by this file in total?Consider a file system that uses inodes to represent files. Disk blocks are 16 KB in size, and a pointer to a disk block requires 4 bytes. This file system has 12 direct disk blocks, as well as single, double, and triple indirect disk blocks. What is the maximum size of a file that can be stored in this file system? Show calculation steps
- There are many parameters that could be used to describe disk performance; among them are: number of bits per track disk capacity (in bits) number of disk surfaces rotational speed rotational latency transfer rate tracks per surface sectors per track blocks per track sectors per block seek time speed of disk arm block-read time number of blocks Some of these parameters are independent, and others are (approximately) linearly related. That is, doubling one doubles the other. Decide which of these parameters are linearly related. Then, select from the list below, the relationship that is true, to within a close approximation. Note: none of the statements may be true exactly, but one will always be much closer to the truth than the other three. Also note: you should assume all dimensions and parameters of the disk are unchanged except for the ones mentioned. a) If you double the number of sectors per block, then you double the number of blocks on the disk. b)…There are many parameters that could be used to describe disk performance; among them are: number of bits per track disk capacity (in bits) number of disk surfaces rotational speed rotational latency transfer rate tracks per surface sectors per track blocks per track sectors per block seek time speed of disk arm block-read time number of blocks Some of these parameters are independent, and others are (approximately) linearly related. That is, doubling one doubles the other. Decide which of these parameters are linearly related. Then, select from the list below, the relationship that is true, to within a close approximation. Note: none of the statements may be true exactly, but one will always be much closer to the truth than the other three. Also note: you should assume all dimensions and parameters of the disk are unchanged except for the ones mentioned. a) If you divide tracks into half as many blocks, then you double the read time for a block.…A student finishes a Ph.D. working on a problem that has aspects that are directly patentable and solve a major problem in the disk drive industry. His new job could be with Hitachi or Seagate, or some similar firm. He arrives at the new job and discovers that the work done as a student, which is in the patent process, will solve the problem at his new company. If he reveals what he knows to his new employer he will be an immediate hero, but will compromise the patent process at his original institution. This step could have important financial implications for the original institution in the form of royalties. What are the relevant ethical considerations in this dilemma? The answer could depend on missing information, such as the nature of the contract signed by the student with his institution, if any, and the nature of its intellectual property rules. This information may have an impact on what the correct ethical response is.