global search for file names

"search/find function in lightroom 5.2 to search for files by file name in a drive."

Me Confused!  v5.2 your photos are stored in the Adobe Cloud. Why would you be searching a "drive"?

Lightroom can use many types of search, as well as inspecting image attributes such as camera metadata or flags and keywords. One form of search is to look within the filenames. If you show the filter bar when in Library ( \  key), click for a Text search, you can opt there to only search within filenames, rather than across all image attributes.

That filter will work on whatever subset of images you are currently displaying (or, all the Catalog's images if you are viewing the "All Photographs" special Collection).

One kind of subset might be a particular subfolder. It might be a particular Collection or Smart Collection. It might be a Collection Set, and show all images within all Collections inside this Set.

Similarly for Folders, you can opt to show just the direct contents of a folder / the contents of all subfolders of a given folder, as well as its direct contents. Uncheck / check (respectively) the option "Show Photos in Subfolders". That's in the Library menu, or else in the drop-down menu of the + icon next to the title of the Folders panel.

So the question also was, how to limit your search to only the photos within a given drive, assuming there are other drives' contents also imported to your Library - that you don't now want to search within. Of course you will only be searching through the photos within that drive that are imported to this Catalog.

TO do that you need the top folder that encloses all of the desired photos, to be visible in the Folders panel. If that it is not already showing, right-click on current top level folder and choose "Show Parent Folder" until that does show. It is likely not necessary to go all the way up to the root folder of the drive, although you can.

So click on that parent folder for all your imported images within this drive. Ensure 'show photos in subfolders'. Filter this set down to show only those that meet your filename search.

Lightroom does not require that you search within a folder. Click on "All Photographs" (it's on the left under "Catalog") and then do your search.