general query about the assumption of values of given K or M like for 30KB or 30KB what to take k= 1^3 or 1024

Question

in COA whenever I m doing any some in mock tests... where its given data like 30KB or 60MB which value to be considered? for K and M here??
I mean when the answer is in mseconds or nseconds there is a significance of these value... how I know what to consider?? please verify.....

Comments

If question is something like Time taken to read 20 KB with disk transfer rate (DTR) 10 MBps

Since sectors are in power of 2. Ideally 20 KB should be treated as 20 * 2¹⁰ 

About the DTR I am not sure...