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555型磁带机是一种适用于高速通用数字计算机的微小型磁带机,它的两个主要特点是:价廉及固定单元访问。若要更换信息时,最小可以以3个二进位的信息单位进行替换,并且不影响其它的相邻信息。这种磁带机具有信息重写能力及相当高的数据传送速度。其体积很小,每个3 1/2吋的磁带盘可卷250呎长(3/4吋宽)磁带。每吋磁道存貯400位。每盘总存貯量约为400万位,相当于4,000呎纸带的存貯量。
The Model 555 Tape Drive is a miniature tape drive for high-speed general purpose digital computers. Its two key features are: Affordable and fixed unit access. To change the information, the minimum can be 3 binary units of information to be replaced, and does not affect other adjacent information. This tape drive has information rewriting capabilities and a fairly high data transfer speed. With a small footprint, each 3 1/2 inch tape reel can carry a 250-foot (3/4 inch wide) tape. Each inch track storage 400. The total storage capacity of each disk is about 4 million, equivalent to 4,000-foot tape storage.