United cloud disk client, server, system and united cloud disk serving method

Disclosed are a united cloud disk client, server, system and a united cloud disk serving method capable of implementing united cloud disk services. The united cloud disk system includes: a principal service provider and a third party service provider, wherein the principal service provider includes a united cloud disk server and storage resources. The united cloud disk server is configured to process a cloud disk service request transmitted by a united cloud disk client, an application, a third party engine or the third party service provider and call the storage resources and/or the third party service provider to provide united cloud disk services; the storage resources are configured to be called by the united cloud disk server to access data; and the third party service provider comprises a united cloud disk third party service provider and a non-united cloud disk third party service provider and is configured to be called by the united cloud disk server. The united cloud disk server includes at least one of an identifier management module, an account management module, a file service module, an object service module and a block service module.