I buy a new 1 TB my passport. make its two partions and coppied mydata into it. But once I opened the disk management of my laptop. it asked me to initialize it as GPT OR MBR. I selected MBR. And my data vanishes and also its partions. there shows only one partion, black coloured., unlocated. if i will make it a new volume then my data will be deleted. so what should i do
Please know as your drive is already showing unallocated in Windows Disk management, the data that was stored on your drive is already deleted.
You refer to the link mentioned below to create new partitions and setup your drive.