"Missing Operating system_ " After installing Yosemite

Click on Continue. In the link for Testdisk step-by-step, there is also a Deeper Search, which is much slower, but if you notice the start/end of MS data is different from previous "Quick Search" window. This means Yosemite "moved" the partition and corrupted the NTFS Bootloader/manager.

Scan this one first after you select it and "P: List Files".

I suggest a "Deeper Search" . Please see the Testdisk step-by-step page. It is the best resource for this part. You need to look in each MS Data that you find using this. It can take a couple of hours.

This shows you how the blocks actually moved, if you look at it from bottom up where the last entry is t=0, the one above that is t=1, then t=2 and so on. The size is the same, so the partition is being moved a chunk, committed, moved a chunk, committed and so on and so forth.

This is a really bad design decision by Bootcamp engineers. This was done when Mavericks came out. The same mistake is being repeated again. 😢

With the iOS8, iTunes, Bootcamp, Yosemite, WiFi issues, etc., every early adopter is at risk till patches and stability ensue. If Apple would support SL 10.6.8 on current hardware, I would prefer that. It is still the most stable OS X release that I know of. OS 9 was also wonderful.

It is a sector-by-sector scan. 😉

Scroll down to the first MS Data partition and look for familiar files. Please repeat for each MS data partition.