Follow Us :

December2015 Cs Q49

0. A unix file system has 1-KB blocks and 4-byte disk addresses. What is the maximum file size if i-nodes contain 10 direct entries and one single, double and triple indirect entry each?

  • Option : C
  • Explanation :
    block = 210
    block pointer size = 4B
    entries possible in block = 210/22 = 256
    direct pointer gives = 10 * 256 = 10 blocks
    single indirect gives = 256 * 256 = 28 blocks
    double indirect gives = 256 * 256 * 256 = 216 blocks
    triple indirect gives = 256 * 256 * 256 * 256 = 224 blocks
    total = 10 blocks + 28 blocks + 216 blocks + 224 blocks
    = 16843018 blocks = 16843018 * 1024 = 17247250432 ≈ 16 GB
Cancel reply
Cancel reply