Posts tagged "BitLocker Drive Encryption"

Building the next generation file system for Windows 8: ReFS

Another extensive blogpoost on the Building Windows 8 blog:


ReFS, has been designed from the ground up to meet a broad set of customer requirements, both today’s and tomorrow’s, for all the different ways that Windows is deployed.

The key goals of ReFS are:

  • Maintain a high degree of compatibility with a subset of NTFS features that are widely adopted while deprecating others that provide limited value at the cost of system complexity and footprint.
  • Verify and auto-correct data. Data can get corrupted due to a number of reasons and therefore must be verified and, when possible, corrected automatically. Metadata must not be written in place to avoid the possibility of “torn writes,” which we will talk about in more detail below.
  • Optimize for extreme scale. Use scalable structures for everything. Don’t assume that disk-checking algorithms, in particular, can scale to the size of the entire file system.
  • Never take the file system offline. Assume that in the event of corruptions, it is advantageous to isolate the fault while allowing access to the rest of the volume. This is done while salvaging the maximum amount of data possible, all done live.
  • Provide a full end-to-end resiliency architecture when used in conjunction with the Storage Spaces feature, which was co-designed and built in conjunction with ReFS.

The key features of ReFS are as follows (note that some of these features are provided in conjunction with Storage Spaces).

  • Metadata integrity with checksums
  • Integrity streams providing optional user data integrity
  • Allocate on write transactional model for robust disk updates (also known as copy on write)
  • Large volume, file and directory sizes
  • Storage pooling and virtualization makes file system creation and management easy
  • Data striping for performance (bandwidth can be managed) and redundancy for fault tolerance
  • Disk scrubbing for protection against latent disk errors
  • Resiliency to corruptions with “salvage” for maximum volume availability in all cases
  • Shared storage pools across machines for additional failure tolerance and load balancing

In addition, ReFS inherits the features and semantics from NTFS including BitLocker encryption, access-control lists for security, USN journal, change notifications, symbolic links, junction points, mount points, reparse points, volume snapshots, file IDs, and oplocks.

And of course, data stored on ReFS is accessible through the same file access APIs on clients that are used on any operating system that can access today’s NTFS volumes.

NTFS.SYS = NTFS upper layer API/semantics engine / NTFS on-disk store engine; ReFS.SYS = Upper layer engine inherited from NTFS / New on-disk store engine


Continue at source!!

MSDN Blogs

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Posted by plates55 - January 19, 2012 at 8:24 am

Categories: Windows8   Tags: , , , , , , ,

Microsoft Documents Windows 8’s Best Features: PC Reset and PC Refresh

Microsoft today provided a lengthy explanation of two related and key new Windows 8 features called PC Reset and PC Refresh. The post on Building Windows 8 does into quite a bit of detail, expanding greatly on the information I provided previously in my Windows 8 Developer Previewoverview. There, I wrote:

PC recovery. The Windows 8 recovery stuff is awesome and is going to represent a major milestone in PC reliability. There are two major options to note, PC Refresh and PC Reset. With Reset, you get a full reset, and the entire PC is wiped out and reinstalled from scratch. This process takes a few minutes currently and will return the PC to its factory condition; it doesn’t require any external discs or USB key. With Refresh, your files, data, favorites, personalization, and metro style apps are all backed up, the OS is wiped out and replaced, and then everything is reapplied to the PC, leaving you with a pristine, running copy of Windows with everything (except for classic applications) exactly the way they were before. It currently takes 4 to 5 minutes.
I also previously published a Windows 8 Refresh Your PC Screenshot Gallery that features numerous screenshots of these features in action.
But back to Microsoft.
According to the post, PC Reset and PC Refresh will go a long ways towards making Windows 8-based PC behave more like devices, since these features are akin to a hardware “reset” button. The two features are differentiated as follows:
Reset your PC. Remove all personal data, apps, and settings from the PC, and reinstall Windows.
Refresh your PC. Keep all personal data, Metro style apps, and important settings from the PC, and reinstall Windows.
What’s most amazing about these features, of course, is how fast they are. And while I’ve experienced this in the real world, let’s just use the post’s own numbers: On the Developer Preview version of Windows 8, PC Refresh takes about 8 minutes and 22 seconds, while PC Reset (thorough, with BitLocker) takes under 6 and a half minutes. (Without BitLocker enabled, it’s more time-consuming at almost 24 minutes.) The same type of restore using a system image takes about 24.5 minutes by comparison.

Anyway, the post has a lot more detail, as always, if you’re morbidly curious. Plus, there’s a video in there as well.

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Posted by plates55 - January 4, 2012 at 8:22 pm

Categories: Windows8   Tags: , , , , , , ,


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