I've got a 2TB Toshiba drive (formatted as NTFS) that has become very slow and I was wondering if anyone here as any ideas what the problem could be and how I could fix it. All the data I'd need off the drive is backed up, but I would at least like a drive to put it back on to!

In short, it became slow after I had to force power-off the system it was connected to (Pop OS installed on another external drive which I unplugged by mistake) and I haven't bothered to try to fix it in the six months since.

I've tested it on Pop and it takes about 10-20 minutes to mount, and 2 minutes to unmount and safely remove. The data itself seems fine but performance is slow, accessing a 20MB image takes several seconds and selecting the drive in GNOME Disks caused it to freeze.

The drive sounded louder than normal, especially after plugging in.

On Windows, the drive was recognised and browsable immediately, but browsing through folders was very slow - opening some folders causes Windows Explorer to freeze for a while. Some of my double-clicks were mis-recognised as click-to-rename, which took several seconds to activate and during which time Task Manager reported the average response time between 5000 and 11000 ms.

Attempting to load an audio file resulted in lots of buffering. Task Manager reports an active time of 100% (even when not loading files or folders) and the activity never exceeded 100 KB/s (and doesn't sustain it for more than a second). Ejecting the drive takes forever - after ejecting it using the tray icon, the tray icon is not removed (even though there are no other drives connected or listed) and the active time is still 100% with the indicator LED blinking non-stop. The system did not enter sleep right away after me asking it to either.

All of that to say, does anyone know what the issue could be, or how I could find and fix it? Thanks!

Edit: fixed and normal functionality restored (at least so I can check the drive a bit easier) using Scan & Repair in Windows (see my comment).