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近两年美国发展了一种柔软可弯的磁盘,这种磁盘与普通磁盘不同,它的基底是用塑料(Mylar)做成。所以也叫塑料磁盘。塑料磁盘与普通磁盘一样,表面涂有一层磁性材料,用以记录信息,但盘的直径比较小,只有20厘米左右。一片塑料磁盘的存储容量约有二百万位,相当干1900张穿孔卡片的容最。平均取数时间约0.3秒。这种磁盘有如下优点:便于记录、使用、保管、价格低廉、保密性好;并便于携带传送(如可邮寄)。由于塑料磁盘优点较多,用途广。所以采用这种磁盘的装置发展很快,它的主要用途:一、代替过去常用的穿孔卡片与穿孔纸带,作为源数据输入的存储介质,并与输入键盘组成键盘到磁
In the past two years, the United States has developed a soft, flexible disk that is different from normal disks and whose base is made of plastic (Mylar). So called plastic disk. Plastic disk and ordinary disk, the surface coated with a layer of magnetic material used to record information, but the disk diameter is relatively small, only about 20 cm. A plastic disk storage capacity of about two million bits, a very dry 1900 perforation card volume most. Average take time about 0.3 seconds. This disk has the following advantages: easy to record, use, storage, low prices, good confidentiality; and easy to carry delivery (such as mail). Due to the advantages of plastic disks, versatility. Therefore, the use of such a disk device developed rapidly, its main purpose: First, instead of the past commonly used punched cards and perforated paper tape, as the input source data storage media, keyboard and input keyboard composition to the magnetic