[[ Unhappy.
Gonna try and replace the hard drive with another model and hope that the Mac doesn't throw another hissy fit. ]]
Suggestion.
Re-initialize the external drive to HFS+, journaling enabled.
Try again.
I realize that earlier you had posted that you had the drive formatted in "PC format" for "interchangeability" with your other computer(s).
BAD IDEA.
If you are going to keep a drive continually-connected to the Mac, keep it in "Mac format".
Use a DIFFERENT DRIVE (could even be a flash drive) for cross-platform transfers.
Mac drive for Mac stuff.
PC drive for PC stuff.
Third drive for cross-platform stuff.
You may buy another drive, and find that using it the way you're trying to use it now, causes the same problems all over again.
Actually, you might buy another drive in any case.
Initialize the _new drive_ to HFS+ (leave the existing drive "as is").
Move the files you want to use with the Mac to this drive.
See if running it that way works any better.
Gonna try and replace the hard drive with another model and hope that the Mac doesn't throw another hissy fit. ]]
Suggestion.
Re-initialize the external drive to HFS+, journaling enabled.
Try again.
I realize that earlier you had posted that you had the drive formatted in "PC format" for "interchangeability" with your other computer(s).
BAD IDEA.
If you are going to keep a drive continually-connected to the Mac, keep it in "Mac format".
Use a DIFFERENT DRIVE (could even be a flash drive) for cross-platform transfers.
Mac drive for Mac stuff.
PC drive for PC stuff.
Third drive for cross-platform stuff.
You may buy another drive, and find that using it the way you're trying to use it now, causes the same problems all over again.
Actually, you might buy another drive in any case.
Initialize the _new drive_ to HFS+ (leave the existing drive "as is").
Move the files you want to use with the Mac to this drive.
See if running it that way works any better.