<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>