1.create file on floopy disk and write contents：

-> pdev=fdDevCreate(0,0,0,0) /* A:,1.44M,whole disk,offset */

-> dosFsMkfs("/fd0"，pdev)

-> fd=creat("/fd0/myfile",2) or -> fp=fopen("/fd0/myfile","w")

-> buf="what you want to write to file"

-> write(fd,buf,strlen(buf)+1) or -> fprintf(fp,buf)

-> close(fd) or -> fclose(fp)

2.open file and read contents from floopy disk:

-> readbuf=malloc(100)

-> fd=open("/fd0/myfile",2) or -> fp=fopen("/fd0/myfile","r")

-> read(fd,readbuf,100) or -> fread(readbuf,1,50,fp)

-> printf readbuf

-> close(fd) or -> close(fp)

3.on simpc shell:

-> fp=fopen("host:d:/temp/myfile","w")

-> fprintf(fp,"kjkkhjk")

-> fclose(fp)