Windows 10: Windows no longer bootable

I have a MacBook Air that I wanted to triple boot. I installed macOS, then Windows, then Zorin OS. When it was just macOS and Windows, both operating systems worked fine. But after installing Zorin, the Apple boot picker no longer shows Windows as an option, just macOS and Zorin labeled as "Windows". If I select macOS, it boots just fine, and if I select "Windows" it takes me to GNU Grub, which then boots into Zorin just fine. There is an option for Windows Boot Manager in GNU Grub, but that just leads to a black screen and nothing else happens. Is there anything I can do, or do I have

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Multi-bootable USB

Hey guys from TPU, couldn't find any specific thread pertaining to the question asked on title. As mentioned, I'm trying to create a bootable USB, but with many specifics boots available.

I've been trying to create one with multiple boot device including one that enables me to run Windows 10 directly on the USB Thumb Drive but to no avail.

The list of bootable images i'm trying to create are

1. Windows 10 (A full OS running from thumb drive)
2. Windows 10 ISO (Bootable disk image for fresh install)
3. MemTest86+

Have tried YUMI or UUI from the website USB PenDrive Linux but as this is my first time, i don't know how am i screwing up or am doing it right.. Anyone got a rough idea on a step by step guide? Thanks!

 

Ipod bootable drive?

I want to know if I can make my ipod a usb bootable drive.. will it mess up my ipod? I need to flash my video card back to normal.. Neros bootable cd gave me an error. I used a step by step guide, but thats another story.

 

Hard drive no longer bootable

Ok so I figured it out.

So basically what happened was the 2TB drive got a windows update that required multiple restarts. For some reason during what appeared to be the 3rd stage of the update when it restarted it was no longer considered a bootable drive or something. So when i unplugged the 500gb harddrive it booted normally, finished the update and went into windows. I reconnected the 500gb HD again and everything is working just fine like before. Weird.