Disk Space
The amount of hard drive space on the server that is available to your hosted websites.
Disk space is one of the primary requirements. Luckily, disk space is cheap and most sites have relatively low requirements. These facts are not lost on hosting companies, who offer practically unusable amounts of disk space to make their plans appear impressive.
If your space needs may expand rapidly in the near future, check the details on buying additional space for your existing plan, or upgrading to another plan. Make sure your host can meet your current and future needs and do so in a cost efficient manner.
High disk uses also require high bandwidth consumptions in most of the cases unless they are used to store files or back up files only. There is no point in going for higher disk space without more bandwidth.