Is windows partition manager reading ubuntu partition correctly?

It's been a very long time since I dual boot, I'm a linux user, asked to partition a laptop at work, to install ubuntu and keep windows 10. I did that, gave 50gb of ssd to ubuntu, that's where I installed / and 490 gb of hdd and thats where I installed home

So after partitioning Y is the ssd where ubuntu should have been installed

As you can see, Ubuntu has renamed the partitions where it has been installed but Y is untouched and totally free, strange assuming that's where to root directory should go.

Solution 1:

As you can see the filesystem is "RAW". As Windows isn't able to tell how files are organized it can't tell you much of those 50 GB are utilized.

It's likely that you're using some form of ext or similar as the filesystem and Windows doesn't have drivers for those filesystems by default.