Q: Hi, I just deleted over 9,000 High Res images from iPhoto, then when I deleted from my Trash, it only gave 7GB of free space when it should be around 70GB, I have restarted and used disk Utility Erase Free Space which gave me 1 extra GB??

Omni DiskSweeper can locate and delete those files. It can also give you a more accurate read of disk space than Finder or Storage Tab of About this Mac.

Well yes, but you do have to launch it once it is downloaded. Then it will take a little while to scan your drive.

If you want to use it to delete, you'll have to actively do that.

Do you also have a Photo library that was created from the iPhoto Library?  If so the two libraries initially share the same data on the HD via hard links so they don't take up twice the amount of space on the hard drive. They can be copied/backed up independently.

New photos added to either library are independent of the other library.

Here's more info on hard links:

Photos saves disk space by sharing images with your iPhoto or Aperture libraries - Apple Support

The (hard) link between Photos and iPhoto

You would have to delete the same photos from both libraries in order to clear the space expected.

As few thoughts come to mind which may or may not help you.

As mentioned by Old Toad, there is a potential for issues with Photo. Your post indicates that you have OS X 10.10.4 and I think that you would have acquired Photo with that version. If you ever opened it and "imported" your photos, then the links provided by Old Toad are essential reading.

Now, that said, I must also say that while I am expert in many things, not iPhoto. I tried both Photo and iPhoto and don't like them so take my comments as constructive efforts and not expert advice. Hopefully checking out a few of my ideas won't waste your time.

1. When you said you deleted the photos from the trash, I am wondering if the photos were actually in the trash.  It appears they were not since the space changed by such a small amount.

2. As mentioned above, there is the issue of having Photo and iPhoto on the same machine sharing the same library. Since the links are hard links, deleting one does not delete the actual file. (See the article referenced by Old Toad.)

3. I have not experienced your situation, but what I would do is see if the deleted photos are in Photo even after being deleted from iPhoto. (The reverse is possible too, if deleted from Photo, it may be that you still see them in iPhoto.)

4. I personally tried to use Photo once and was confused when I "deleted" a large number of pictures and no disk space was freed. I then realized that "delete" just moves the pictures to a staging area and you must find the appropriate buttons to really delete them.

5. Having said all that, I wonder if all the thumbnails and edited versions are deleted along with the originals when using two different programs to do two different sets of deletions in a shared library.  Someone more expert may know that and it may not matter much for your needs.

As you may already know, the originals for the images are stored in the library (with a name like Originals or Masters) of Photo or iPhoto in the Pictures directory. You need to "view package contents" to get finder to look into the library or use the Terminal and good old fashion Unix commands. If you decide to delete the pictures yourself, be very very careful and back up these libraries somewhere until you are absolutely certain that all is working to your satisfaction. (Of course, messing with cleaning out any files should be preceded by making sure you have an up-to-date back up of everything.  For me, that is more than just Time Machine. It is a full back up of everything to an external drive.)

Good luck and let us know how it works out.

2. As mentioned above, there is the issue of having Photo and iPhoto on the same machine sharing the same library. Since the links are hard links, deleting one does not delete the actual file. (See the article referenced by Old Toad.)

They don't share the same Library. They share the same original files only. It's a very significant difference.

3. I have not experienced your situation, but what I would do is see if the deleted photos are in Photo even after being deleted from iPhoto. (The reverse is possible too, if deleted from Photo, it may be that you still see them in iPhoto.)

They are not deleted in the other app. If you want to remove the files from the disk then you need to delete in both apps and then empty the system trash. Of course, this is an intermediary situation while folks are migrating from iPhoto to the new app. If one is happy with the new app then you can simply delete the entire iPhoto Library and simplify the situation.

5. Having said all that, I wonder if all the thumbnails and edited versions are deleted along with the originals when using two different programs to do two different sets of deletions in a shared library.  Someone more expert may know that and it may not matter much for your needs.

They are.

If you decide to delete the pictures yourself,

Remember that you will corrupt the

iPhoto Library

The Photos Library

Any iCloud Library associated with the Photos Library and potentially, Libraries on other devices linked via iCloud.

So, really, don't so that.