Example: I upload imageABC.jpg

In my default/files/images folder, i see two files:

1. imageABC.jpg
2. imageABC_0.jpg

Am I stating this accurately? I presume I have everything set up properly and this isn't a result of another module. As imagefield Crop works great on my dev site!

My problem is when I delete the node. I go into my database and see that imageABC.jpg has been deleted but imageABC_0.jpg still exists. How do I delete both image files in this case without having to remember which file I just deleted and then going in and manually deleting each leftover cropped image?