'(Un)hydrated' files?

Posted 10/17/2017 3:16 PM
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NorthPole Advanced member

Date Joined Nov 2016
Total Posts: 176
I noticed the terms 'unhydrated' and 'hydrated' files being used in the Release Notes for BIS Build 18.0.341 - despite spending most of my working life in computing, this is an expression I've never encountered before!

As far as I can determine from a quick Google, it seems to refer to databases not yet populated with data - can anyone provide a better explanation?


Posted 10/18/2017 4:42 PM
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BGR64 Member

Date Joined Oct 2017
Total Posts: 2
I guess this means that "offline" files stored in onedrive will not be downloaded locally while being "touched" by Backup/TuneUp

See: http://www.thewindowsclub.com/skydrive-smart-files-windows-8-1
Posted 10/24/2017 11:39 AM
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Andreea-Luciana Ostache Advanced member

Date Joined Nov 2016
Total Posts: 838

Starting with 17th october, Microsoft introduced the concept of hydrated files. That's why you are unlikely to find too much documentation on this yet.

Cloud files are a new type of file, partially or totally in the cloud. They have 0 bytes on disk and are downloaded transparently when someone wants to access them.

Could files only supports NTFS partitions at the moment/

Cloud Placeholder: Local entry which has it's entire content in cloud

Hydrated file/folder: File that has already been downloaded

Un-hydrated file/folder: Placehoder of 0 bytes on disk

So the point is to have a "summarry" of your files, which are actually in a cloud, to quicly download them when you need to access them. It was the obvious next step, it just took a few years for this to take form, if you ask me.
Andreea-Luciana Ostache
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