Recovering deleted photos on Android: what DiskDigger finds without root access
Por Rodrigo Pereira
0
A search for deleted photos may reveal small images that appear to be the file you're looking for. Before celebrating, open the result and check the resolution: a thumbnail saved on the device is not equivalent to the original photo. This difference is crucial to understanding what a recovery tool can offer on a non-rooted Android device.
DiskDigger's information sheet states that rootless searches are limited and can only search caches and thumbnails. The result depends on the data still available and the access allowed by the device. This limitation described by the manufacturer should not be interpreted as a guarantee of results or as an identical rule for all recovery applications.
Why did Android 11 change photo recovery?
Up until Android 10, an app with storage permission would see the entire memory as an open disk and read the free space block by block, looking for the beginning of a deleted JPEG that hadn't yet been overwritten. That's how DiskDigger worked on mobile phones.
Recent versions of Android restrict an app's access to other apps' data and raw storage. Allowing access to shared files does not equate to allowing access to all of the device's memory. The scope of the search depends on the system version, the app, the available permissions, and the location where the photo was stored.
Encryption, flash memory management, and data deletion also limit recovery. It's impossible to conclude that a deleted photo remains intact in free space that any program could read. Even with advanced access, the result depends on the device and storage capacity. A portable memory card and internal memory require different evaluations.
In a limited search, the tool may find reduced copies and images that are still accessible in storage. Avoid performing a cleanup while searching for files: it may remove data that would aid the investigation. The guide to Cell phone cleaning and performance It's about organizing the space after you've preserved what you need.
Basic scan × full scan
DiskDigger calls a search that runs without root access "basic" and a search that requires root access "full." The difference isn't in speed, but in what the app has permission to access.
| Criterion | Basic scan (no root) | Full scan (with root) |
|---|---|---|
| Where are you looking? | Cache and thumbnail folders | All memory, including free space. |
| What returns | Low-resolution copies, many of photos that still exist. | Original files that have not yet been overwritten. |
| recent phone internal memory | It works | It yields little: the free space is encrypted. |
| SD card | Only what has a miniature version. | It works well because the card is not encrypted. |
| File types | Photos and videos | Photos, videos, documents and audio (Pro version) |
| Cost | Free | Pro via R$ 9.53, plus root access on the device. |
Do not unlock the bootloader or root the device as a makeshift recovery attempt. On many devices, unlocking erases data and alters system protection. If the device was already rooted, this changes the available access, but it still doesn't guarantee that a deleted file can be recovered.
Before installing any app: where the photo is still intact
Installing any app overwrites free space, and each scan writes cache. If the photo is still intact in some trash bin, the app only gets in the way. Samsung, Xiaomi, and Motorola galleries have their own trash bins; Google Photos keeps deleted photos for 60 days with backup enabled and for 30 days without; Google Files has its own trash bin. The timeframes and menu path for each are in the [link to Google Files app]. 30 and 60-day waste bin guide.
What if nobody deleted anything? Photos that disappear on their own are usually hidden by a .nomedia file, stuck in a folder that the gallery stopped reading, inside WhatsApp/Media, or on an SD card with a bad connection. Each case has a different location, and the A guide that diagnoses where the photo disappeared from. It goes through all of them before reaching the app.
DiskDigger step by step
DiskDigger is published by Defiant Technologies. Its listing describes limited search capabilities without root access and the available destinations for saving results. The privacy statements in the app store are provided by the developer and should be read along with the requested permissions. To use the search without root access, follow the steps presented in the application:
- Install via the Play Store and open it. On a non-rooted device, a full scan requires superuser access and stops immediately. Stick to the basic scan.
- Grant access permission to the files when requested. Without it, the list will be empty.
- Leave the app in the foreground until it's finished. On some devices, the list of results is lost if it goes into the background.
- In the options, set a minimum file size, something like 100 KB. This removes the tiny thumbnails from the screen and leaves only the copies with a chance of being used.
- Select what you want to save and tap Recover. The app will ask for the destination: Google Drive, Dropbox, email, or a local folder.
What the results screen shows
The results may include existing images, thumbnails, and other accessible copies. Check the size, resolution, and content before saving. The displayed date may be linked to the found copy, not the time the photograph was taken. A search without satisfactory results does not authorize a promise that another tool will find the original version.
Where to save what was found.
Choose a destination different from the storage location being investigated, especially when recovering data from a memory card. Consider the privacy of the image before sending it to a cloud service or via email. If the file is sensitive, use a destination under your control and ensure the copy was saved correctly.
Basic scan without root access that reads caches and thumbnails; full scan requires root access.
Dumpster: the trash can that only protects from now on.
Dumpster is presented by Baloota as a trash bin and file recovery tool for Android. Its usefulness depends on the available functions, permissions, and the data it has managed to preserve. Don't assume it will intercept every deletion made in any application: confirm its functionality in the folders you intend to protect.
An additional recycle bin can only restore a copy that is available to it. Installing a tool after the loss does not guarantee the reconstruction of the previous file. Dumpster also offers paid cloud storage features; check the plan and what has actually been protected before relying on it as your only backup.
A recycle bin that keeps a copy of what you delete from the day of installation.
Google Files and Google Photos: the trash bins that come pre-installed on the device.
Google Files
Google Files is Google's own file manager, pre-installed on most Android devices. Two functions are of interest here: the Trash (recycle bin): files deleted within Files remain there for 30 days. And the "Free up space" button, which suggests deleting WhatsApp media, old downloads, and photos that are already backed up, and this is where many photos "disappear": the person accepts the suggestion without looking at the list. If you've used Files in the last 30 days, check the Trash before any scan.
Google File Manager with a 30-day Recycle Bin and suggestions for freeing up space.
Google Photos
In Google Photos, check the trash and the account used for backups. Backed-up items can remain in the trash for 60 days, and unbacked-up items for 30 days, according to the service's help instructions. Permanent deletion or the expiration of the time period prevents restoration from that trash. A separate copy may still exist elsewhere.
Cloud backup and 60-day recycle bin: deleted photos are restored in full resolution.
SD card: remove from phone and recover on PC
An SD card used as portable storage may allow for a recovery attempt on a computer, provided the data is still available and the card can be read. This does not guarantee recovery of the original data. Encrypted cards or those configured as part of internal storage require different handling. Do not accept a formatting offer while searching for files.
- Stop using the card immediately: no new photos, no app updates, no file transfers. Each recording could overwrite the photo.
- Turn off your phone and remove the card. If it was formatted as "internal storage" (to receive apps), it's encrypted and the computer won't be able to read it; in that case, you'll need to use DiskDigger on the phone itself.
- Insert the card into a card reader on your computer. If Windows offers to "format" the card when it recognizes it, decline.
- Use a computer photo recovery program. PhotoRec, which is free and open-source, is the most well-known and can read the card even if the file table is damaged.
- Send the results to the computer's hard drive, never back to the memory card. Only after checking the photos can the card be formatted and returned to the phone.
The less time between deleting and the card reader, the more intact the photo becomes. A card that has been in the phone for weeks receiving new photos and WhatsApp cache has less and less of the old photo to return.
How do these apps make money and what do they ask for in return?
None of the four charge for installation. DiskDigger sells the Pro version for R$9.53, and it only makes sense with root access: it adds documents, audio, and video to the full scan and an option to permanently delete free space; for photos on a non-rooted phone, the free version does the same basic scan. Dumpster sells a cloud subscription, which also removes ads. Files and Google Photos are from Google, and Photos earns extra storage when you exceed the 15 GB of free storage in your account and subscribe to Google One.
Read the justification for each access request made by the tool. Broad file permissions increase access to personal data, but do not unlock raw storage or guarantee recovery. If a permission does not match the desired function, consult the documentation and consider another option before granting access.
Signs of a scam recovery app on Play
Search for “recover photos” on the Play Store and the list is full of generic names with the same trash can icon and the same promise. There are a few signs that separate a tool from a trap:
- It promises to recover "photos deleted years ago" without root access. This is not possible on Android 11 or newer.
- It shows how photos you still have in your gallery have been "recovered." It's the most common trick: the app lists the entire cache, and the user thinks it worked.
- Cobra to “restore in high quality”. The high-quality version does not exist in the cache; payment unlocks the same thumbnail.
- Displays a full-screen ad before each result and requests accessibility permission.
- It has a generic name and a developer with dozens of nearly identical apps. Restore Image, which used to appear in older lists, now returns a non-existent page on the Play Store: it's been removed from the store.
- It uses the name of another app. On the App Store there is a “DiskDigger Photo Recovery” from a developer other than Defiant Technologies; Defiant's DiskDigger does not have an iPhone version.
Common questions
Do I need root access to use DiskDigger?
DiskDigger's basic search function works without root access and has the limited scope described by the developer. Root access can change the available access, but it doesn't guarantee recovery. Avoid altering the system after data loss: unlocking the bootloader can erase data and worsen the situation.
Can I recover photos from an SD card using my cell phone?
The result depends on how the card is configured and the access permissions granted. If it is portable and can be removed, a computer scan may be an option. Preserve the card, do not format it, and save any results to another storage device; seek assistance if it shows read errors.
Is photo recovery always guaranteed?
No, and what determines the outcome is where the photo was taken from. A photo in the Google Photos trash or gallery will be restored intact within the time frame. A photo on an SD card will be restored if nothing has been written over it. A photo deleted from the internal memory of a modern Android device, without backup and outside the trash, is limited to a thumbnail cache image, and even that doesn't exist if a cache cleaner has been used beforehand.
DiskDigger showed me photos that I still have. Is that normal?
As expected. The basic scan lists the entire device cache, and most of it consists of photos that remain in the gallery, as well as stickers, covers, and icons. Deleted photos, when present, appear in the middle of this list in a reduced size. The minimum size filter helps to sift through the data.
Is there DiskDigger for iPhone?
No. iOS doesn't allow any app from the App Store to scan the memory, and anything that appears there with that name is from another developer. On the iPhone, the path is Photos, Albums, Recently Deleted, then iCloud and backup, and everything is in... Guide to recovering deleted photos on iPhone.
First step, before any download: open the trash bin in your gallery and in Google Photos and look for the photo there. If it's not in either and you're using an SD card, turn off your phone and remove the card. Only if none of that works, install DiskDigger, run a basic scan, and save what it finds to Drive.
