硬盘上的一个物理记录块要用三个参数来定位：柱面号、扇区号、磁头号。硬盘容量=柱面数×磁头数× 扇区数×512字节，扇区越多，容量越大。
下表给出标准尺寸和容量的软盘道数和扇区数。
The following table shows the number of tracks and sectors on floppy disks of standard sizes and capacities.
死区效应可被视为一种空间矢量，它由两个因素决定：扇区数和相电流方向。
Dead-time effects can be regarded as a kind of space-vector, which is determined by two factors: sector number and direction of phase current.
对于任意阶电平数的逆变器而言，这种算法能够方便地判断出参考空间矢量所落入的扇区，非常容易地进行矢量的合成运算。
For the inverters of the levels of any order, this algorithm can easily judge which vector the reference space vector falls in, and conduct the composition operations of the vectors.
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