Behind the scenes: Photo sharing on SkyDrive

Have you ever wondered what goes on behind the scenes of photo sharing on Skydrive? Over on Inside Windows Live, Eric Doerr wrote an interesting post about it. For example did you know that they store four copies of your photos on their servers, just incase something happens? And foremost that this don’t count against your free 25GB?

That you can upload your photos in original size and that, by default, they will be resized automatically to 1600 x 1600 pixels? If you don’t want your original to be resized to 1600×1600 then you can also choose to keep the original.
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Next, for quick loading, they will be resized into nine smaller versions:

  • 800 x 600 px max. – for web slideshows
  • 600 x 450 px max. – for single photo view
  • 320 x 320 px max. – for large mobile phones
  • 176 x 176 px max. – for small mobile phones
  • 96 x 96 px max. – large thumbnails for the web
  • 48 x 48 px max. – small thumbnails for the web

And into 3 thumbnail sizes:

  • 213 x 213 – large square thumbnails
  • 104 x 104 – medium square thumbnails
  • 48 x 48 – small square thumbnails

So, in total they store four copies of every original, plus nine additional sizes!

In the last year little more than 2 billion photos got uploaded to SkyDrive and shared with hundreds of millions of people. On a normal day between 4 and 5 million unique photos! That’s a whole lot of storage!

More info, for example on how to share albums (different people uploading to one album) and your privacy, can be found in the blog post.

The team has a lot more ideas about photos, they’ll announce some neat ones in the coming months. Stay tuned!