Generally available: Support for up to 100 TB of storage for the FHIR service

The FHIR service in Azure Health Data Services supports up to 100 TB of storage. The FHIR service can store and exchange large amounts of health data, and each FHIR service instance has a 4 TB storage limit by default. However, if you have more data, you can ask Microsoft to increase storage up to 100 TB for your FHIR service.
Source: Microsoft Azure – aggiornamenti