I have a 2 TB hard-disk partitioned as:
- HFS+ (1 TB);
- FAT32 (500 GB);
- NTFS (500 GB).
I’d like to wipe out the NTFS partition and format as HFS+. Is there a way to do this without modifying the rest?
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It theoretically should be safe to reformat the NTFS partition with gparted or other utility (probably run from another drive such as a USB Linux ISO drive*), though it may be necessary to first mark the partition as unformatted, empty space, and then reformat as HFS+.
That stated, I would recommend that a complete disk image first be made (and checked!), so that you can revert if the unthinkable happens. [Murphy's Law states data is damaged only when there is no backup, so you should be OK.]
*As @AFH states, it's possible to format an inactive partition, but if you want to consolidate space or reallocate it amongst other partitions, running from another drive makes it feasible.