Choose the Disk??™s Rotational Speed
The disk??™s rotational speed controls to a large extent how fast it can deliver data to the
PC: the faster the rotational speed, the faster the data gets transferred. It also affects
how much energy the disk uses, how hot it becomes, and how much noise it makes.
At this writing, 5400 rpm disks are the best choice for laptop PCs. 4200 rpm disks
are less expensive but slower and are seldom worth buying; however, if your laptop
uses a 1.8-inch disk, you may need to settle for a 4200 rpm disk. 7200 rpm laptop disks
are also available, but they tend to have lower capacity than the 5400 rpm disks and
produce more heat and noise.
For desktop PCs, 7200 rpm disks are normally the best choice, giving good performance
with high capacity. Many 7200 rpm 3.25-inch disks are also impressively
quiet, which can be welcome when you need to concentrate. Faster disks (for example,
10,000 rpm or 15,000 rpm) are typically designed for servers and tend to be
too noisy for desktop use.
A factor that most people ignore when buying hard disks is the amount of noise they make.
Given how close your laptop is to you while you are using it, a quiet or silent hard disk is usually
a good idea. Even on a desktop PC that normally is several feet away from you, a quiet or silent
hard disk can make the difference between peaceful work and struggling to concentrate through
an irritating noise.
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