External disk is hijacked by fsck when plugged in to Macbook

External disk (2 TB Seagate) is captured by fsck when plugged into a USB 3.0 port on my Macbook Pro (macOS Mojave 10.14.5). This has been discussed by @ArielAllon, and indeed, when I kill the fsck process, the disk is immediately mounted and I can see and read it. When I eject the disk and plug it in again, I always have to kill fsck. I have left fsck running for 12 hours and it never completes. When I kill it, a pop-up warns that the disk could not be repaired. My problem now, as Ariel mentioned, is that the disk is read-only, owned by root (or wheel?). I would like to use the remaining 150 GB on the disk, (remove old backups, etc) and prevent fsck from capturing it when attached. Thanks for any help...