三个磁碟将给你三倍输贯量和三分之一的表面搜寻时间。
Three disks would give you three times the throughput and a apparent seek time of a third.
磁碟：任何有着可以用磁力作贮存，删除，再贮存的表面的圆形板片的总称。
Magnetic DisC: a generic term for any flat circular plate having a magnetic recording surface onto which data may be recorded, erased and recorded.
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