WipeDrive.c

#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>

int main(void)
{
    int fd = open("/dev/sdd", O_WRONLY);
    if (fd < 0) {
        fprintf(stderr, "Error opening device file.\n");
        return EXIT_FAILURE;
    }

    // Write 0's all over the disk, in chunks of 512 bytes.
    char* zeros = calloc(1, 512);
    ssize_t written, total = 0;
    do {
        total += written = write(fd, zeros, 512);
        printf("\rBytes written: %ld", total);
    } while (written == 512);
    printf("\nDone!\n");

    close(fd);
    free(zeros);
    return 0;
}