What is information storage?

Play? What is cap 4? ⒂ Threatening to give a man a bath? ⑽ scratch your toes and swallow your cangue? Hold on. Disadvantages: slow information transmission and inconvenient retrieval. Advantages of thin film: high storage density. Disadvantages of easy query: inconvenient reading through interface equipment and high cost. Computer information storage-material evolution information storage materials have been mainly magnetic records since 50 years ago. The recording density of disk has exceeded 108 bits/cm2, and that of magnetic tape is 0.2? 108。 Disks and tapes are made of magnetic powder (? -Fe2O3 ferrite) is coated on a magnetic disk or an organic film, and the product has low cost and good stability. CrO2 developed in 1960s and iron oxide powder modified with (Co++) are materials with high recording density. Ultrafine iron powder (0.20.02? ), in the 80 s (package? At (0. 1? Diameter) and (0.0 1? Thickness of the disk) has good magnetic recording performance. Metal thin film recording has been studied since 1950s. Up to now, multiple thin film materials such as Co, CoNi, CoNiCr, CoCr/NiFe vertical recording double film have been developed, which has a wide application and development prospect. The magnetic recording characteristics of the three materials are compared as follows: -Fe2O3), sputtering continuous film (Co-Cr) and perpendicular recording bilayer film (CoCr/FeNi), and their commercial application levels are 65,438+02,000 (bits/inch), 40,000 (bits/inch) and 65,438+050 respectively. The application limitation is