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- (a) What is involved in low-level formatting of a disk (HDD)? (d) A file consists of 20 disk blocks (numbered O to 19). Assume that file control block and directory are already in the memory. A block is to be inserted in the middle of the file (as 10th block). How many disk read and how many disk write I/'O operations are needed if contiguous allocation scheme is used by the file system ? ReplyForwardQUESTION 16 Which of the following statements is not true of basic disks? a. A basic disk is organized into one or more defined areas of storage called partitions. b. Basic disks are an older technology that were introduced as an alternative to dynamic disks. c. Most of a basic disk's partition attributes are stored in a data table on the disk that is part of the MBR or GPT specifications. d. When a new hard disk is added to a computer, it is initially configured as a basic disk.The system wide open-file table is used to maintain information about files that are currently open. Should the operating system maintain a separate table for each user or just maintain one table that contains references to files that are being accessed by all users at the current time? If two different programs or users are accessing the same file, should there be separate entries in the open file table?
- Suppose the size of the file that we are trying to sort is 512 disk blocks and the available buffer space in main memory = 4 disk blocks. Calculate the following: The number of initial runs (nR) The number of passes (nP) students claims thats nP=3.5Concerning disk initialization, which of the following is not true ? GPT disks are limited to a maximum of 128 volumes. MBR disks are limited to a maximum of 4 primary partitions. MBR disks are limited to a maximim of 2.2 TB of available storage. GPT disks are limited to a maximim of 2.2 TB of available storage.Consider a file F whose data is spread over 1000 physical disk blocks on the disk. Assume the size of a logical block is equal the size of a physical block. Given a logical block number X, what is the maximum number of disk accesses that you would need to retrieve the physical block that corresponds to X? Assume the file control block of F and the directory entry that contains information about F are cached in the main memory.
- 79. The type of allocation in which blocks of file are allocated to consecutive blocks of disks is classified as a. indexed allocation b. header allocation c. contiguous allocation d. linked allocationA hard disk drive's filesystem must be used by all of the drive's partitions after formatting in order for it to be deemed complete. Does this claim have any merit as being true or false?Suppose that a disk unit has the following parameter: block size B = 1200 bytes Consider a STUDENT file with the following fields: NUMBER, 10 bytes; • LASTNAME, 20 bytes; FIRSTNAME, 20 bytes; BIRTHDATE, 10 bytes; The STUDENT file has r=10000 STUDENT records, fixed-length format, and unspanned blocking. Calculate the following values for the STUDENT file: (a) Calculate the record size R (b) Calculate the blocking factor bfr (c) Calculate the number of disk blocks b
- Operating systems Consider a disk with 25 cylinders. While the head arm is on cylinder 10, new requests come in for cylinders 5,20,15,3 and 9 respectively. How many disc arm motions are required to complete all these read requests with elevator disc scheduling algorithm? Algorithm select the right side for first motion. A)5 B) 10 C) 24 D) 27 E) 431. Which is NOT a function of the file management system? a. File security and protection of file integrity b. Permits manipulation of data within a file c. Provides a logical view for the user and hides the physical implementation d. Manages directory structures and space allocation for each I/O device e. Allows the use of paging scheme in the storage of files. 2. An MS-DOS table that contains the first block of each file on the disk or disk partition. a. Acyclic directory b. NTFS c. Master file table d. File allocation tableCalculate how much disk space (in sectors, tracks, and surfaces) will be required to store 300,000 120-byte logical records if the disk is fixed sector with 512 bytes/sector, with 96 sectors/track, 110 tracks per surface, and 8 usable surfaces. Ignore any file header record(s) and track indexes, and assume that records cannot span two sectors. ***Background information for next question that I need help with. Consider the disk system described above, and assume the disk rotates at 360 rpm. A processor reads one sector from the disk using DMA, with one interrupt per sector. If it takes 2.5 μs to process each interrupt, what percentage of the time will the processor spend handling I/O? (disregard seek time)