That sounds like that program is checking the disk. I'd wait for the results before doing anything. But it could well be it needs to be repartitioned and formatted again.
Using Macbook Pro, OS 10.6.8. Just updated to the most recent version of Superduper and backed up my hard disk to my external, same as I have been doing for some years.
Backup seemed to have gone fine, but when I went to check the external hard drive a couple of hours later (after having restarted my computer) it would not mount.
Noticed the internal hard drive running very fast so I checked Activity Monitor. A file called fsck_hfs was taking up about 60% of memory. And it just kept running fast and running and running. I could not eject the external as it did not show up on my desk top. Finally just had to shutdown everything and disconnect. Tried it again and got same result.
Disk utility does see the volume, but that does not help anything.
Can anyone tell me how to get the external working again?