Help Android Memory Wipe

[vipul230192]

I deleted several photographs from my android phone and I checked it with file managers that they are not present in any of the folders. But when I took back up of my phone on laptop, out of no where one of the photos appeared there. I understand the reason being "Android OS just free up the space instead of overwriting and the files will be present there until it is being overwritten". How do I wipe this memory other than overwriting? Because by overwriting, I can never be sure of non-existence of these files? I would like to know as simple procedure as possible. Also I just want to wipe these pictures, not other files and contacts. I am using Android 4.2

 

[Hadron]

A backup won't make copies of deleted files.

Are you sure these photos weren't backed-up with any cloud service, and hence weren't restored the next time it synced?

 

[vipul230192]

Yes. My phone is not synced with any of the cloud servers.
I simply copy pasted both the internal storage and SD card folders to laptop. That picture was deleted long back, and I can't locate that picture in my mobile.

 

[Hadron]

That's very odd. Heck, you don't even get USB Mass Storage these days, just MTP, so it's not as if you even have low-level access to those drives. And the location it was in in your backup matches where it had originally been on your phone?