Component Object Model (COM) Error – STG_S_BLOCK 0x00030201

In this post, you’ll learn about the error “STG_S_BLOCK 0x00030201” that is returned when working with COM based APIs or libraries in Windows.

COM Error Message

STG_S_BLOCK 0x00030201

What is COM?

Microsoft’s COM stands for Component Object Model. Component Object Model (COM) is a networked, object-oriented framework for building interoperable binary software components.   Microsoft’s OLE (compound documents), ActiveX (Internet-enabled components), and other products are built on the COM base technology.

Error Description

Below is the description of this COM Error.

The storage operation should block until more data is available.