New hdd to mycloud

Does anybody know what format i need for the new hdd in order to change the one that is inside the wd mycloud. For example when the hdd 3tb has problem and we need to replace it? How can we replace it and what else we must do in order to work?

It’s not that simple.  The HD has multiple partitions of different file systems (EXT3 / EXT4 / Swap / etc.).

…and the OS is on the HD, not in flash memory, so you’ll have to know how to manually install the full operating system.

Could you please help me to fix it? I formatted it now to ext3. I dont know about the operating system. Do you know how to fix my cloud? If you dont want to write it here sent me please the instructions to my email [Deleted] thanks a lot my friend.