Your code is in severe need of simplification and cleanup before we can consider whether using File::Find would improve it.
For example, write off the bat I detected three variables which are declared but never used:
$size
$name
$SDIR
Get rid of them -- and while you're removing them, also delete all the commented-out code, which only serves as a distraction to those reading your post and trying to help you.
Next, note that on line 56 you assign $drive to $dirlist[0], and then within five lines you call for a loop over the contents of @dirlist. If you only have one entry in the list over which you are iterating, you can ditch the for loop as well.
Thank you very much.
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