论文部分内容阅读
磁盘存贮器是用磁记录方式进行大量存贮信息的一种外部存贮器。它具有存贮容量大、价格低、信息存取速率高和可靠性高等优点,因此被广泛地使用在电子计算机上。磁盘存贮器可分为固定磁头型和活动磁头型两种。固定磁头型磁盘具有较大的容量和高的存取速率但造价较高,在早期作为电子计算机的主存贮器使用,现在作为主存贮器与大容量活动磁头型磁盘存贮器之间的具有中等速度和容量的层次存贮器使用,或作为容量较小的快速外存贮器使用。活动磁头型磁盘具有大容量和低价格,存取速度较高等特点,一般作为大型计算机的大容量随机存取外部存贮器使用,或者作为小型计算机的价格便宜的外部存贮器,如盒式磁盘与软盘来使用。
Disk storage is the use of magnetic recording of large amounts of information stored in an external memory. It has the advantages of large storage capacity, low price, high information access rate and high reliability, so it is widely used in electronic computers. Disk storage can be divided into two types of fixed head and movable heads. Fixed head-type disk has a larger capacity and high access rate but higher cost, early in the computer as the main memory to use, now as the main memory and bulk active head-type disk storage Level memory with medium speed and capacity, or as a fast external memory with smaller capacity. Active disk type magnetic disk with large capacity and low price, high access speed and other characteristics, generally used as large-capacity random access external memory of a large computer, or as a small computer cheaper external memory, such as cassette Disk and floppy disk to use.