# Secondary Storage

 Question 1
A magnetic disk has 100 cylinders, each with 10 tracks of 10 sectors. If each sector contains 128 bytes, what is the maximum capacity of the disk in kilobytes?
 A 12,80,000 B 1280 C 1250 D 1,28,000
ISRO CSE 2020   Computer Organization
Question 1 Explanation:
 Question 2
A particular disk unit uses a bit string to record the occupancy or vacancy of its tracks, with 0 denoting vacant and 1 for occupied. A 32-bit segment of this string has hexadecimal value D4FE2003. The percentage of occupied tracks for the corresponding part of the disk, to the nearest percentage is:
 A 12 B 25 C 38 D 44
ISRO CSE 2018   Computer Organization
Question 2 Explanation:

 Question 3
SATA is the abbreviation of
 A Serial Advanced Technology Attachment B Serial Advanced Technology Architecture C Serial Advanced Technology Adapter D Serial Advanced Technology Array
ISRO CSE 2017   Computer Organization
Question 3 Explanation:
 Question 4
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 Mbyte, 19 bits B 256 Mbyte, 28 bits C 512 Mbyte, 20 bits D 64 Gbyte, 28 bits
ISRO CSE 2016   Computer Organization
Question 4 Explanation:
 Question 5
A hard disk system has the following parameters :
Number of tracks =500
Number of sectors/track =100
Number of bytes /sector =500
Time taken by the head to move from one track to adjacent track =1 ms
Rotation speed =600 rpm.
What is the average time taken for transferring 250 bytes from the disk ?
 A 300.5 ms B 255.5 ms C 255 ms D 300 ms
ISRO CSE 2015   Computer Organization
Question 5 Explanation:

There are 5 questions to complete.