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 for storing file attachments (for example presentations, spreadsheets, images, or Adobe® PDFs, and so on).
Salesforce CRM (Enterprise Edition) provides 1 GB for data storage and 1 GB for file storage. In total, this 2 GB storage amount (1 GB for data plus 1 GB for files) is the minimum total storage 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 storage factor.
As an example, an organization with 500 active users sees the storage amount for data, say, increase to 10 GB. This is calculated as 500 (users) multiplied by 20 MB which equals 10,000 MB or 10 GB.
To view your organization's used data space and used file space, follow the path Your Name | Setup | (Administration Setup) ...