Will formatting the FreeDOS partition make Windows 10 unbootable?

I bought a Lenovo Y700-17ISK and it came with FreeDOS on a separate partition in the beginning of the hard drive. It looked like that:

FreeDOS 1 GB - unallocated space 931 GB

Then, I installed Windows 10, creating a new partition beforehand, so it looked like that afterward:

FreeDOS 1 GB - Windows 10 300 GB - unallocated space 630 GB

I wanted to install Xubuntu alongside Windows 10, so I ran a Xubuntu installer and I was given the information that the disk is divided in the following manner:

• /dev/sda1: fat32, 1 GB, FreeDOS
• /dev/sda2: ntfs, 300 GB, no operating system
• /dev/sda3: ntfs, 631 GB, no operating system

I am wondering if I am able to boot Windows 10 after installing Xubuntu, for I can clearly see that no operating system was found on /dev/sda2. That's why I began thinking about removing the partition with FreeDOS and merging it with the Windows 10 partition, but I am uncertain if doing so might remove the possibility to boot Windows 10, too. After all, the FreeDOS partition is in the beginning of the hard drive. I am using the MBR partitioning style.

What should I do? I want to remove that unnecessary 1 GB partition (I regret that I didn't do that while installing Windows), it is a primary partition and it's also annoying for that reason.

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