This GVP HD8 Amiga 500 harddrive was one of the best harddrives you could get for the Amiga 500. I used to have one in my Amiga stash. I got it in a deal that consisted of multiple A500s and A2000s.
If I remember correctly, my memory is vauge, they had the possibility to carry up to 8 MB memory and could take a regular SCSI 3.5″ HDD. The design matched the A500 so well.
That switch on the front of the harddrive was for turning it off (don’t quote me on that though).
Sadly long since sold since I am mostly into A1200 and A4000 these days.