Yes, the drive would be mounted again. After running chkdsk you would simply reboot your computer and all should be well.
"It means that chkdsk has ended access to the drive by any other program or
process. A handle is a number, a reference to a particular file on disk or
So, if for example you had an open Word doc that was on that drive, Word
would lose access to it when chkdsk invalidated the handles.
chkdsk needs exclusive access to the drive to operate. So it allows you to
dismount the volume. Alternately, if it can't it will offer to schedule the
scan at next boot."
In other words you should close any open programs before running chkdsk at a command prompt.
If you choose to do it from a command prompt you would type something like this: chkdsk /f C: (replace the C with the drive letter you want to check)