The best software for disk encryption with an already installed OS?

Question

Encryption

We set the task: to encrypt a disk with Windows 7 Starter (one physical disk, divided into two logical ones) .
I didn't come across this at all, but somehow I used TrueCrypt for a long time , and I was happy as an elephant. I went to their website in search of a solution, and was surprised: not only did they close the project, they also offer to migrate to BitLocker. Digging through the Internet I found a small article .
What can you recommend from free solutions? Although paid, you can also consider)
Well, a cool bonus will be cross-platform :)

Answer 1

Trucrypt and advise)

Answer 2

Here is another article to justify TrueCrypt: habrahabr.ru/post/254777
The only thing missing is GPT support, which was never added. But if you have an OS on an MBR disk, TrueCrypt is the best solution.

Answer 3

https://en.wikipedia.org/wiki/Comparison_of_disk_e...
For every taste