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)
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