linux 直接读取扇区

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>

#define SECTOR_SIZE 512

int main() {
    int fd;
    off_t offset;
    char buffer[SECTOR_SIZE];

    // 打开磁盘设备文件，例如 /dev/sda
    fd = open("/dev/sda", O_RDONLY);
    if (fd == -1) {
        perror("Error opening disk");
        return 1;
    }

    // 设置要读取的扇区号，例如第10个扇区
    offset = 10 * SECTOR_SIZE;
    if (lseek(fd, offset, SEEK_SET) == -1) {
        perror("Error seeking disk");
        close(fd);
        return 1;
    }

    // 读取扇区数据
    ssize_t bytesRead = read(fd, buffer, SECTOR_SIZE);
    if (bytesRead != SECTOR_SIZE) {
        perror("Error reading disk");
        close(fd);
        return 1;
    }

    // 处理读取的数据，这里简单地打印出来
    for (int i = 0; i < SECTOR_SIZE; i++) {
        printf("%02x ", (unsigned char)buffer[i]);
        if ((i + 1) % 16 == 0) printf("
");
    }

    close(fd);
    return 0;
}