Hi dsoelter,
NTFS format will have read-only permissions on a Mac but should be accessible on a Windows computer. Since the drive is showing up and seems to pass some of the tests it sounds like the drive may be physically ok at this point. However, it does sound like a logical issue such as a damaged/corrupted partition. If you need to recover the data I would not recommend formatting it. This could make the issue worse.
One thing I would try is a different cable to make sure that the USB cable isn’t bad. Since it is a Passport drive, I would recommend a cable that is less than 10-12" long. If the drive still isn’t working properly then you may need to try some data recovery software or contact a data recovery company. I included a link below on some recovery companies that we are partnered with if you decide to go that route.
Data Recovery
