WD 500GB My Book Displays Inaccurate Free Space

Good day,

I’m new to the forum, and seek a solution to why my 500GB My Book displays inaccurate free space.

Used quarterly to backup documents, photos, and music files, I began deleting the older data from prior years.  Two days ago, I noticed that the remaining free space is still at 41.4GB.  I opted not to defrag, until I’m finished deleting the old files, and to minimize wear.

This is the first time that I’ve experienced this, and would welcome any advice toward getting this hard drive back-on-track.

…and thanks, in advance.

Incidentally I also have this issue with a 1TB drive. Showing as 200 gig free when I only have 200 gig of data on it.

Any help would be appreciated.