Consider a disk pack with 16 surfaces, 128 tracks per surface, and 256 sectors…
2018
Consider a disk pack with 16 surfaces, 128 tracks per surface, and 256 sectors per track. 512 bytes of data are stored in a bit-serial manner in a sector. The capacity of the disk pack and the number of bits required to specify a particular sector in the disk are respectively:
- A.
256 MB, 19 bits
- B.
256 MB, 28 bits
- C.
512 MB, 20 bits
- D.
64 GB, 28 bits
Attempted by 311 students.
Show answer & explanation
Correct answer: A
Disk Capacity: 16×128×256×512 bytes bytes}16×128×256×512 bytes =2 4 ×2 7 ×2 8 ×2 9 =2 28 bytes=256 MB Bits to specify a sector: Surfaces: log 2 16=4 bits
Tracks: log 2 128=7 bits
Sectors: log 2 256=8 bits
4 + 7 + 8 = 19 bits