Originally posted in the Microsoft Azure Blog.

Azure Blob Storage is a massively scalable object storage solution capable of storing and serving tens to hundreds of petabytes of data per customer across a diverse set of data types including media, documents, log files, scientific data and much more. Many of our customers use Blobs to store very large data sets, and have requested support for larger files. The introduction of larger Block Blobs increases the maximum file size from 195 GB to 4.77 TB. The increased blob size better supports a diverse range of scenarios, from media companies storing and processing 4K and 8K videos to cancer researchers sequencing DNA.

Azure Block Blobs have always been mutable, allowing a customer to insert, upload or delete blocks of data without needing to upload the entire blob. With the new larger block blob size, mutability offers even more significant performance and cost savings, especially for workloads where portions of a large object are frequently modified. For a deeper dive into the Block Blobs service including object mutability, please view this video from our last Build Conference. The REST API documentation for Put Block and Put Block List also covers object mutability.

We have increased the maximum allowable block size from 4 MB to 100 MB, while maintaining support for up to 50,000 blocks committed to a single Blob. Range GETs continue to be supported on larger Block Blobs allowing high speed parallel downloads of the entire Blob, or just portions of the Blob. You can immediately begin taking advantage of this improvement in any existing Blob Storage or General Purpose Storage Account across all Azure regions.

Larger Block Blobs are supported by the most recent releases of the .NET Client Library (version 8.0.0), the Java Client Library (version 5.0.0), the Node.js Client Library (version 2.0.0) and the AzCopy Command-Line Utility (version 5.2.0). You can also directly use the REST API as always. Larger Block Blobs are supported by REST API version 2016-05-31 and later. There is nothing new to learn about the APIs, so you can start uploading larger Block Blobs right away.

This size increase only applies to Block Blobs, and the maximum size of Append Blobs (195 GB) and Page Blobs (1 TB) remains unchanged. There are no billing changes. To get started using Azure Storage Blobs, please see our getting started documentation, or reference one of our code samples.