Show the current folder that's being scanned in the Title bar of the scanning dialog.

When the program is scanning a hard drive, have the name of the folder it's currently scanning show in the Title Bar of the SCANNING dialog.

Since you already know what folder is being scanned, just assign the name of it to a variable and have that variable show in the Title Bar. And have it auto-update the Title Bar as it works through all the folders of the hard drive.