HP Smart Array 6i Controller and 128MB BBWC - Manual (Page 40)

40 HP Smart Array 6i Controller User Guide
With an array controller installed in the system, the capacity of several physical
drives can be combined into one or more virtual units called logical drives (also
called logical volumes and denoted by Ln in the figures in this section). Then,
the read/write heads of all the constituent physical drives are active
simultaneously, reducing the total time required for data transfer.
Because the read/write heads are active simultaneously, the same amount of data
is written to each drive during any given time interval. Each unit of data is called
a block (denoted by Bn in the figure), and adjacent blocks form a set of data
stripes (Sn) across all the physical drives that comprise the logical drive.
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