No, it does not automatically wipe the selected disk when installing MacOS Mojave on non-Apple hardware.
No, it does not automatically wipe the selected disk when installing MacOS Mojave on non-Apple hardware.
The installer clears the drive, taking Windows out first before adding MacOS afterward.
Opt for a dedicated disk for dual booting to simplify your setup. A 240GB SSD priced around $40–50 is a practical choice.
Use a partition manager compatible with NTFS and HFS+ like GParted. Then reduce the size of the NTFS volume. Afterward, set up the HFS+ partition. Ideally, opt for a separate drive for this setup.
I believe hackintosh isn't allowed to discuss on this forum, though macOS can preserve other partitions if set up correctly—specifically using a GUID partition table with an EFI system partition of at least 200MB. Installing Mojave onto an HFS partition on an SSD will convert it to APFS during installation, but this won't impact any other partitions.