<p>Transaction performance relates among other things from
I/O performance. This means hard disk performance.</p>
<p><b>Hard disk performance</b></p>
<p>When you select a hard disk, an important feature to
consider is the performance (speed) of the drive. Hard disks come
in a wide range of performance capabilities. As is true of many
things, one of the best indicators of a drive?s relative
performance is its price. An old saying from the
automobile-racing industry is appropriate here: "Speed costs
money. How fast do you want to go?"</p>
<p>The performance of a hard disk depends on several delays
associated with reading or writing data on a computer's disk
drive.</p>
<p>A measurement, called average access time (AAT),
involves the elements, average seek time (AST), average
rotational latency (ARL) and transfer time (TT).</p>