I ran CHKDSK on my Windows 8.1 Pro 64bit laptop. The message said that it was up to 11% and then it stopped advancing for ages. I thought that CHKDSK had stalled or crashed, but it turns out that it was working, it's just that it took several hours to complete one stage but it didn't update the progress indicator.
MORE DETAILS
I ran CHKDISK from the command prompt on my C drive and it offered to run the command on the next restart. I answered yes and restarted, and CHKDSK ran, updating its progress, but it stopped at 11% and stayed there for ages and ages.
Note that in Windows 8.1, CHKDSK doesn't display lines of text as it goes along like in certain earlier versions of Windows. It just displays a single line, e.g. "Scanning and repairing drive (C:): 11% complete" that gets updated from time to time.
At first I thought it was stalled or crashed, so I rebooted the laptop. CHKDSK ran again and once again got stuck at 11%. So I rebooted the laptop with a recovery USB and ran CHKDISK from the command prompt. This one displayed more progress information. It estimated that a particular stage would take 3 or 4 hours (it fluctuated from one to the other at first before settling on over 3 hours and then slowly counting down). After several hours it completed successfully, fixing some errors and reporting its results.
I rebooted the computer again, from the hard drive. CHKDSK ran again (since it didn't complete before) and after several hours it completed. It warned me that Windows didn't close normally (because I interrupted the previous CHKDSK) and gave me some options.
So it looks like there's one stage in CHKDSK where the status line isn't getting updated regularly. Could Microsoft please fix this?
EDIT: corrected spelling of subject heading.