Deleting photos as you go?

I've always deleted from camera if I review something and know it's not going to work out, I've never had an issue. I figure this frees up space in the card over time and several images being deleted just in case I need that extra space if I forget my other cards or don't have time to change. I also figure this will save a little bit of time when it comes time to import onto the computer.

Once upon a time I used 2G cards (I have a feeling there were some 512M cards also, and the earth was flat at that time), themdays space was at a premium and anything seriously unacceptable got deleted.
Currently using 64G cards & don't have the same need to cull before getting home.

Engineered_Reflex wrote in post #18138582
It would be much easier for me to delete when I'm chimping in the field and I would use fewer cards too. Is there really extra risk in doing this?

From memory card point of view, NO, not extra risk at all. When you delete a photo, you actually didn't "erase" anything. All you do is to mark content invalid, so when the next file come, the host (camera) can reuse those location for new files. At that time, things get erased and re-written.

For CF and SD, their interface don't support trim command, so over writing is the same as delete + new write. With CFast, it is little different. CFast is SATA, so trim command is supported. So delete + new write will give your less garbage collection.