External HD

I always use Disk Utility to erase a new drive based on my intended usage for it, regardless of how it is formatted when I receive it:

1. Read/Write access by Windows, Mac, and Linux
   1. Erase as FAT32, or exFAT
2. Read/Write access by macOS
   1. Formatting per 1.1
   2. Erase to HFS+ Journaled (implicitly case-insensitive) with GUID partition scheme (all versions of macOS)
   3. Erase to APFS Journaled (implicitly case-insensitive) with GUID partition scheme
      1. For Mojave, Catalina, or Big Sur interoperablity

MacOS does not natively support writing to Windows NTFS, or Linux drive formats.

Make sure it is formatted for your Mac. Use Disk Utility to check and format it if necessary.