How many random / sequential access per fread / fwrite?

Question

I have the following question regarding C file I/O.

At a physical level (harddrive), is it valid to assume that every fread(n_blocks, size, length,FILE fp)

Answer 1

From the point view of an application programmer, the exact process of reading the blocks is indeterministic. It all goes down to the disk scheduler that organizes the access operations of multiple requests at the same time from multiple processes. There are multiple algorithms to solve this issue, but thinking too simplistic(1 random seek, n sequential seeks) is not realistic at all. In the end, neither the C standard nor the C++ standard define such a thing for clear reasons.