Zend certified PHP/Magento developer

How can I create an external HDD using a dual booted internal HDD?

I had an old laptop that I dual booted with ubuntu and windows 10. So I decided to use its internal hard drive as an external hard drive and bought the enclosure and everything needed.
The problem I am having is that my current laptop only has windows installed and I can only access the windows partition of the drive.
So how can I format the drive and make the entire drive accessible across all platforms(Windows, Linux, MAC and TV)