what is the difference between disk space and bandwidth, and how to estimate them?

No web hosting plans do not have the disk space and bandwidth in the offer, so it is important to know the difference between disk space and bandwidth.

Disk space
Disk space (also called a data storage or hosting space) is the maximum size space on the web host server that can be used to save the html files, images, audio / video messages, e-mail, and other file types.

Html pages are usually very small, take a picture more space, database and retrieve large amounts of data, then you must determine how much space you will need for your website in accordance with the content.

There is a simple method to calculate the amount of disk space required for your website, simply right-click on the folder containing the files on the PC website and select properties, now you know how much disk space you will use on the server.

Bandwidth
Bandwidth (also called the date of transfer) is the volume of traffic coming to your site, when people visit your website, their computer is connected to your host server to view your page. This causes data to be transferred from one place to another.

To explain that, if your site contains one page of html that is10kb large, and holds a 90kb image that large, you will transfer 100kb of data for each visitor that see your site. So, 10 means your visitor will be used 1.000kb bandwidth

Transfer of data is usually measured in gigabytes - billions of bytes, and per month, and in most cases is very rare for personal or small business site to use more than one gigabyte of data transfer in one month

Estimate the bandwidth you not calculate your required disk space, so that you can use the following formula:

[The average size of your web page (s) + any graphics included in] * [number of visitors you expect each day * number of pages each visitor will view] * [30 days in a month] = Total Monthly Data Transfer Usage.

Although the previous formula seems easy to understand, but difficult to do with your own, so you have to speak with a web hosting company
and they help you select the right amount of bandwidth.