Does deleting files actually free up space?
When a file is deleted, the space used on the disk is not reclaimed until the file is truly erased. The trash (recycle bin on Windows) is actually a hidden folder located in each hard drive.
- Uninstall unnecessary apps and programs. Just because you're not actively using an outdated app doesn't mean it's still not hanging around. ...
- Clean your desktop. ...
- Get rid of monster files. ...
- Use the Disk Cleanup Tool. ...
- Discard temporary files. ...
- Deal with downloads. ...
- Save to the cloud.
Empty Android's cached files
If you've deleted all the files you don't need and you're still receiving the “insufficient storage available” error message, you need to clear out Android's cache.
When you delete a file, the operating system marks the area where that data resides on the hard drive disk (HDD) as available, and logistically removes it from the file tree structure. The magnetic data still resides on the disk, but the pathway to accessing the data has been removed from the operating system.
On an Android phone, go to Settings > Storage
If you drill down into the category, you can delete individual files or data. For example, under “Audio,” long-press on one or more files and tap Delete. Or under “Apps,” tap the app's name and then Uninstall to remove it from your phone.
Free up space on your Android device
Important: This feature deletes photos from your device.
Sometimes the "Android storage space running out but it's not" issue is caused by the overwhelming amount of data stored on your phone's internal memory. If you have many apps on your Android device and use them simultaneously, cache memory on your phone can be blocked, which leads to Android insufficient storage.
Why does my computer say there is not enough disk space when there is? There could be some hidden or virtual memory files taking up space, and you need to delete the files on the virtual partition. It is also possible that you have a disk format limitation.
If you're seeing an "Insufficient storage available" message on your Android, chances are that you've used up most of your device's available memory. To fix this, you'll need to make some space by deleting apps and/or media; you can also add external storage, such as a Micro SD card, to your phone.
Examples of reasons for deleting files are: Freeing the disk space. Removing duplicate or unnecessary data to avoid confusion. Making sensitive information unavailable to others.
How long does deleted files last?
The Recycle Bin will hold onto deleted files for 30 days, giving you time to restore items deleted accidentally.
If you delete a photo or video that's backed up in Google Photos, it will stay in your trash for 60 days. If you delete an item from your Android 11 and up device without it being backed up, it will stay in your trash for 30 days.

Junk files are also created by the apps you use. The most common types of junk files on your phone include: Temporary app files are used to install apps, but they're useless after installation is complete. Once the app is installed, these files are no longer needed to make the app run smoothly.
Old or Unwanted Songs, Podcasts, and Videos
Some podcasts and videos are hours long, and it's easy to forget just how much storage it takes to keep them on your phone. It's important to check your downloads frequently to make sure you're not holding onto large files.
(transitive) To make (space or time) available. Selling those old books freed up most of the spare room. You can free up space on your hard disk by deleting temporary files.
The best way to free up space on your iPhone is to remove files you don't need to store on your device. But that doesn't mean you have to downsize your photo library. Instead, try storing them in a third-party cloud storage service like Google Photos rather than on your device.
Clear out all cached app data
These caches of data are essentially just junk files, and they can be safely deleted to free up storage space.
So where do deleted files go? Whenever you delete a file in your computer and empty your Recycle Bin, your data is not entirely wiped out from your computer. Although you can no longer see the file in the location it once was and your operating system no longer has it, a copy of it still exists on your hard drive.
Hi, They both do basically the same, except selecting Clean The Drive will write zeros to the entire drive before reinstalling... Just Remove Files deletes the Files without writing zeros...