There's been a very ugly trend in the web hosting industry as of late regarding 'unlimited' bandwidth plans. Web hosting providers are advertising 'unlimited' bandwidth in order to seem like they can provide something they cannot. This is simply an IMPOSSIBLE task. When a customer then exceeds their cpu LIMIT as stated in the terms of service their service often gets suspended or even completely terminated (wait i thought you said it was unlimited?!).
The reason for the existence of these plans is that for the majority of websites who consume such a small amount of bandwidth, bandwidth seems unlimited because they don't have the capability to exceed. If you're never exceeding and there's no problems, then the bandwidth does in fact seem unlimited. However, websites that have high traffic, i.e. online retailers that have plenty of graphics and customers will be affected by high bandwidth.
Keeping it Simple
Disk Space: The space on the server you have to completely store your website
Bandwidth: Amount you have to transfer web pages from the servers to your browser (FF, IE, Safari, Google Chrome) etc. that the visitor is using.
Think of a car, The entire car is the disk space. Some cars can hold 2 people, some can hold 8. The gas would be like the bandwidth. What affects your bandwidth would be the things that affect gas mileage. The more of those things you have on, the less mileage you get. Now imagine, an automaker advertising that they are offering cars with unlimited gas tanks, and gas mileage is a non issue. Sounds fishy doesn't it? Now lets take the car for a drive with the Air Conditioning on until the gas runs out. We now go to the automaker and complain, and they simply say that according to the terms of service, we weren't allowed to drive a certain distance anyway, so to remedy the situation, we have to buy a bigger car with a bigger gas tank.
OR, you exceeded your bandwidth so you now have to buy a bigger plan that allows more bandwidth and is much more costly because the webhoster lied that they could provide unlimited service.
To avoid situations like these, simply estimate your bandwidth and choose the appropriate plan or our specialists can help you with this process. You may have noticed that HD does not offer an unlimited plan.