Microsoft have released a new blog post on their Windows 8 development blog.

The post, written by Bryan Matthew, a program manager on the Storage & File System team discusses the work they have done focused on scale and capacity.

They identify two key challenges regarding data management on really large drives:

  • Ensuring that the entire available capacity is addressable, so as to enable full utilization
  • Supporting the hard disk drive vendors in their effort to deliver more efficiently managed physical disks – 4K (large) sector sizes

They go on to say that a side benefit of UEFI firmware is that it will handle larger disks better ergo it is one of the reasons that Windows 8 will require UEFI.

…the UEFI specification was developed as a replacement for BIOS and implementations have existed since the late 1990s. UEFI was designed from the ground up to work with very large capacity drives by utilizing the GUID partition table, or GPT…Beginning with Windows 8, multiple new capabilities within Windows will necessitate UEFI. The combination of UEFI firmware + GPT partitioning + LBA allows Windows to fully address very large capacity disks with ease.

Microsoft are saying that they fully expect Windows 8 to install on disks larger than 3 Terabytes.

In addition, they are stating that Windows 8 is the first OS with full support for both types of AF disks – 512e and 4K Native. They go into much more detail on the blog..

Basically they have addressed the following issues..

  • Introduce new and enhance existing API to better enable applications to query for the physical sector size of a disk
  • Enhancing large-sector awareness within the NTFS file system, including ensuring appropriate sector padding when performing extending writes (writing to the end of the file)
  • Incorporating large-sector awareness in the new VHDx file format used by Hyper-V to fully support both types of AF disks
  • Enhancing the Windows boot code to work correctly when booting from 4K native disks

The bottom line is, with NTFS in Windows 8, Microsoft will fully leverage the capabilities delivered by their hardware partners to efficiently support very large capacity disks.


About the Author

Onuora Amobi is the Founder and VP of Digital Marketing at Learn About The Web Inc. Onuora has more than a decade of information security, project management and management consulting experience. He has specialized in the management and deployment of large scale ERP client/server systems.

In addition to being a former Microsoft MVP and the founder and editor of, he is the CEO of a Pasadena based online marketing education startup - Learn About The Web Inc. ( and The Redmond Cloud (

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