Why does disk stop scanning?

[eagleknight 4]

I have an 2TB external drive that reported 23GB's of enreadable sectors. No SMART errors were reported. I scanned the portion again and it checked out OK. I then marked the whole disk unchecked and told it to check. I checked it the next day and it only scanned about 25%. I started it again, but it stopped scanning. I have done this a number of times and it keeps stopping. Is something throttling it? Is there a log to know why it is pausing or stopping the scan?

[Christopher (Drashna) 638]

Do you have a work window specified?

Also, is it throttling based on disk activity or heat?

[eagleknight 4]

Yes, yes, and yes. I thought though if you kicked it off manually it would scan. If it doesn't that is Ok, I just wasn;t aware. It did finish scanning overnight.

[Christopher (Drashna) 638]

If you mean the "Start" button in the toolbar, then that allows it to scan it as per the other rules.

 

If you want to force it to scan immediately, there is a start/play button in the disk details (next to the volume map), if you click on the "+" next to the disk.