现在看到的软盘都是3.5英寸的,通常简称3寸。3寸软盘都有一个塑料外壳,比较硬,它的作用是保护里边的盘片。盘片上涂有一层磁性材料(如氧化铁),它是记录数据的介质。在外壳和盘片之间有一层保护层,防止外壳对盘片的磨损。软盘提供了一种简单的写保护方法,3寸盘是靠一个方块来实现的,拔下去,打开方孔就是写保护了。反之就是打开写保 Now see floppy disks are 3.5 inches, usually referred to as 3 inches. 3-inch floppy disk has a plastic shell, relatively hard, its role is to protect the inside of the disc. Disk coated with a layer of magnetic material (such as iron oxide), which is recorded data medium. Between the shell and the disc has a protective layer to prevent the shell of the disc wear. Floppy disk provides a simple method of write protection, 3-inch disk is achieved by a square, unplug it, open the square hole is write-protected. The opposite is to open the protection