Salesforce CRM has two categories of storage, namely, data, which is used to store records (for example, Opportunity, Account, or Custom object data records), and file storage, which is used to store file attachments (for example, presentations, spreadsheets, images, PDFs, and so on).
Salesforce CRM (Enterprise Edition) provides, as a minimum, 1 GB for data storage and 11 GB for file storage. In total, this 12 GB storage amount (1 GB for data plus 11 GB for files) is the minimum total storage that's allocated for a Salesforce CRM organization. However, the storage amount increases as more active users are added, since there is also a 20-MB-per-user for data and 2-GB-per-user for files storage factor.
As an example, an organization with 500 active users sees the storage amount for data increase by 10 GB. This is calculated as 500 (users) multiplied...