sinosinarello wrote:
Sure, I had already thought of buying a second hd both for moving and for having a backup copy then.
But the initial formatting is necessary on both operating systems, right? I still think that the fact that the hd is now practically unusable on the MacBook depends on the fact that initially I've formatted it only on pc...
You want to swap the HDD around, right? That means using a compatible storage volume format. Which means FAT family (which is a less than stellar volume format) or NTFS read-only access, or acquiring an NTFS read-write app (such as Paragon).
Or it means using a file share, and re-purposing the HDD.
If you want to use the HDD exclusively with macOS, then reformatting as APFS or HFS+ would be typical.
On Windows exclusively, reformatting NTFS would be typical.
If you want to use the HDD for Time Machine on macOS, set it up for that.
As the topic sometimes arises in these discussions… If you should decide to use partitioning, you will absolutely want to keep backups of all partitions with valuable data, as partitioning sometimes goes wrong and corrupts some or all of the partitions present, and the recovery is reformatting. One of the very few ways to mark data as valuable is with backups, as you’re otherwise one mistake or app crash or corruption or errant deletion or one hardware failure away from a catastrophe without backups. Internal or external, all storage inevitably and inexorably fails.
