RA81 disk drive of VAX 11/780 in Purple Mountain Observatory is very important lor VMS system of VAX, programme and data of user, Here is how to analyze the RA81 error.

• RA81磁盘因装有整机系统,用户程序,科研结果,故RA81对vax11/780计算机及用户来说,都是至关重要的。