5英寸磁盘，最小磁道的直径为4厘米，最大磁道直径为8厘米，每分钟10000转，共有20记录面，每个记录面有8000个磁道，每条磁道上有511个扇区，每个扇区实际记录有600个字节，其中有效数据为512个字节。则这个磁盘存储器的有效存储容量是(6)GB，磁道密度是每毫米(7)条磁道。

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MIMD　systems　can　be　classified　into(71)-oriented　systems,　high-availability　systems　and　response-oriented　systems.　The　goal　of(71).　oriented　multiprocessing　is　to　obtain　high(71)(72)minimal　computing　cost.　The　techniques　employed　by　multiprocessor　operating　systems　to　achieve　this　goal　take　advantage　of　an　inherent　processing　versus　input/output　balance　in　the　workload　to　produce(73)and(74)loading　of　system(75).

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Prior　to　the　UML,　there　was　no　clear　leading(66)language.　Users　had　to　choose　from　among　many　similar　modeling　languages　with　minor　differences　in　overall(67)power.　Most　of　the　modeling　languages　shared　a　set　of　commonly　accepted　concepts　that　are　expressed　slightly　differently　in　various　languages.　This　lack　of(68)discouraged　new　users　from　entering　the　OO　market　and　from　doing　OO　modeling,　without　greatly　expanding　the　power　of　modeling.　Users　longed　for　the　industry　to　adopt　one,　or　a　very　few,　broadly　supported　modeling　languages　suitable　for(69)usage.

Some　Vendors　were　discouraged　from　entering　the　OO　modeling　area　because　of　the　need　to　support　many　similar,　but　slightly　different,　modeling　languages.　In　particular,　the　supply　of　add　on　tools　has　been　depressed　because　small　vendors　cannot　afford　to　support　many　different　formats　from　many　different(70)modeling　tools.　It　is　important　to　the　entire　OO　industry　to　encourage　broadly　based　tools　and　vendors,　as　well　as　niche　products　that　cater　to　the　needs　of　specialized　groups.

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