Have you had experience working with disk subsystems?

Yes, I have experience interacting with the disk subsystem at the level of working with files and buffers in C/C++. For example, I implemented functions for reading and writing large files using buffering to minimize the number of I/O operations and improve performance.

A simple example of reading a file with a buffer in C++:

#include <fstream>
#include <iostream>

int main() {
    std::ifstream file("data.bin", std::ios::binary);
    if (!file) {
        std::cerr << "Failed to open file" << std::endl;
        return 1;
    }

    const size_t bufferSize = 4096;
    char buffer[bufferSize];

    while (file.read(buffer, bufferSize) || file.gcount() > 0) {
        // Processing read data
        std::cout << "Bytes read: " << file.gcount() << std::endl;
    }

    file.close();
    return 0;
}

I also have experience working with system calls for managing files and disk resources.