磁盘历经无数次的增删后，往往会变得支离破碎，扇区零零落落、毫不连接，形成好多碎片，分配的零碎空间就会太多，致使文件链出现混乱，文件的存储变得不连续。也就是同一文件占用的扇区不连续。因为经常对硬盘进行读写、删除等操作后，被删除的地方就会留下空白，而ＤＯＳ写 Disk countless additions and deletions, often become fragmented, fragmented sector, no connection, the formation of a lot of debris, the distribution of the system will be too much fragmentation, resulting in chaos in the file chain, the file storage becomes discontinuous . That is, the same file occupied by the sector is not continuous. Because often on the hard disk to read and write, delete and other operations, the deleted place will leave a blank, and DOS write