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Reddit
reddit.com › r/ios › ios 15.x 'storage bug' case scenario
r/ios on Reddit: iOS 15.x 'Storage Bug' Case Scenario
December 3, 2020 -

I updated my devices to iOS 15.3 hoping the Storage Bug issue would be resolved but unfortunately that is not the case.

After doing some careful logging, testing, re-setting different iphones, installing App by App case scenario to try to find out 'what' could be causing that 'famous' (or should we say infamous) 'Storage Bug' case, I've been able to trace tha cause to 'some' specific apps.

A bit of Background Info:

-under normal circumstances, an App will store it's 'app data' along with the app itself.

This information should be listed with the 'App' itself under the section 'Documents & Data' section in within each app.

A 'good' example of this would be the Apples own 'Music' App:

The picture in the link immediately below shows what it should look like:

For this example, 'Music' shows 12.97 GB of usage which once clicked to see the details on that category itself it is shown in the details as follows:

App Size: 15.3 MB

Documents and Data: 12.96 GB

which in this case corresponds with the ammount of music that I have downloaded to my iphone (ie. synced through itunes)

'Most' Apps behave in this fashion.

What i've found however, is that 'some' apps are having a problem in the latest iOS versions and thus, the 'Data' that normally should only be stored in the 'Documents and Data' section with each app itself is being DUPLICATED and stored TWICE:

-once in the 'Documents and Data' section with the App itself (which alone should be normal)

AND

-a second time, DUPLICATING, the size and Data in 'Other Data' (also known as System Data in iOS)

In my particular case scenario, namely within the Apps I currently use and have installed in my own devices (namely iphones), i found out that one of the apps I have installed generates this Storage Bug.

This app causing (of the apps I use) is the 'TomTom Go' for iOS App ('TomTom Go' for iOS is used for Navigation and enables users to download maps locally).

If I 'restored from backup', then after the process was completed, the huge 'Other Data' would be there as well, so I would not be able to identify 'what' was causing it... so in my case scenario, the 'only' way I was able to identify the cause --for my case scenario-- was to set up the device as a brand new device and install one app at the time and see the impact with the 'Other Data' (also known as 'System Data' in iOS).

The picture in the link below shows right after I've reset my iphone and re-set it up as a brand new device and TomTom Go for ios is just installed:

Notice that the Size of 'Documents & Data' is extremely small, only 18 KB which is normal as there are no maps downloaded.

The picture in the link shows TomTom Go for ios with Map Data downloaded (17+ GB):

App Size: 188.8 MB

Documents and Data: 17.34 GB

However the 'same' ammount found in 'Documents and Data' in the TomTom Go App would immediately increase in the same ammount also in 'Other Data' (also Known as 'System Data' in iOS)

Just in case, I'm adding a couple of pictures right after I re-set my iphone (which I've done with 3 different devices in the last few days, each has replicated the same phenomena, so it's not a 'device' issue, but different iphones 6S Plus, 8, 10, etc... all running ioS 15.3) showing the size of 'Other Data' which right after the re-set was about 1Gb

Since this post is already long as it is, I'm not including a bunch of additional information, though relevant probably even helpful to add (even more) details to this Storage Bug problem, but I rather wouldbe insterested to hear if there are out there other users that may have run more detailed analysis and if so, I would welcome those details. If there are any iOS developers out there that may have the knowledge in the changes in the recent iOS releases that may share some light into why this is happenning... I'm thinking more in lines that there have been changes in iOS implemented, to which iOS developers may know that additional commands should be added in the code of an app to cause the app(s) to 'dump' their 'cache' data from 'Other Data' (also known as 'System Data in iOS)?... again, if there are any of you out there than can share more light into this issue, I would certainly appreciate it.

Top answer
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Appreciate this deep dive, I've come to terms with this part of iOS having been broken for as long as I can remember, who fucking knows much free space you have. Plug it into a computer and get a completely different answer.

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Thank you for the quick feedback.

As I mentioned at the end of the post, if I included all the information about the all infamous 'Storage Bug' the post would be tooo long and too boring to read through.

This situation applies to many apps... not 'only' the 'one' App I mentioned.

Other apps such as (and not limited to, listed in NO particular order), that are 'also' affected by the 'Storage Bug' issues in iOS 15.x are: Pis Sharing apps, Chat, Social Media apps, etc... even people with just their iOS Pic sync process have been having issues ... so this is NOT limited to third party developed apps, but also with even apps that apple itself has released.... other people have been having issues with way, way too many other apps to list them all.

In our household, my other half, who used to uses whatsapp, had exactly the same problem (we ditched the app, so that 'solved' that 'Bug Problem' for us.. but as I said on my original post, 'deleting' the app (and it's data') does NOT deleted all the stuff left over in the 'Other Data' side...so, you delete the app and the data AND 'Other Data' (also Known as 'System Data in iOS') will remain the same (at best, 'Other Data' will decrease slightly but never return back to what it was before.)

As I already mentioned, the 'only' way I'm able to get 'Other Data' back to a more 'normal' size was to, hard re-set the device(s) (I've replicated this phenomena on several devices now, and on each device re-set several times and tried several different options.. such as, not limited to, listed in no particular order: delete just the app and it's data (not successful recovering/reducing 'Other Data' back to what it was before), on the app itself attempting to clear it's own data (as in whatsapp, and other such apps that offer that option --even on TomTom Go for ios itself... still no success there.)

The 'only' way to get 'Other Data' back to a 'normal' size was to hard re-set and star from scratch... once I identified which app(s) were causing this phenomena, at least in our household, we ditched and switched to other apps, as much as we could... that said, for example, we still use TomTom Go... so that became an issue.

In any case, since there are too many apps out there, that generated the same issue there with the 'Other Data' increase, is that I rather have an interest to hear from an iOS programmer, and see if maybe there is a command that should be coded into the app itself to force it to 'dump' it's cache/clear the 'other storage' data that just stores and stores without stopping (in SQL for example, you can truncate a table with the Truncate command that will wipe out the entire table of it's data clean WITHOUT generating a gigantic Log... but that is in SQL... so that was my asking and thinking process, IF there is a change with the newer version in iOS that may have caused this and a well experienced iOS programmer may know the answer/solution to this issue... as so far, the developer of these apps and Apple itself have not produce a solution to this ongoing problem with the 'Other Storage' Bug that simply blows up in size without any control whatsoever (and to count that most people don't even know 'where' the size increase in 'Other Data' is coming from.. as most people will at best, reset a device and 'restore' from backup.. .since that is a one and done process ... at the end, they end up with a device with a huge 'Other Data' size and don't know where that is coming from... in my case I've been able to identify the apps that affected our household... but again, the list is long and the only common thing is that 'Other Data' just grows and never goes down (or if app and data completely deleted, then 'Other Data' might decrease, but ever so slightly and never fully go back down to what is was (see my pictures on the main post of 'Other Data' size at the beginning of the device set up... )

Look forward to hear from any programmer, if such command(s) exists (though seems that is not possible as, since iOS 14 to the latest version of iOS ... right now ios 15.3 has been an ongoing issue)

Best regards

🌐
Apple Community
discussions.apple.com › thread › 253298572
iOS 15.1 taking more iPhone storage - Apple Community
There had been an issue with incorrect storage figures with earlier versions of iOS 15, however iOS 15.1 was supposed to correct that. My iPhone 13 Pro report Zero KB of 512 GB Used. Now it reports correctly.
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Apple Community
discussions.apple.com › thread › 255354961
iPhone storage bug - wrong space - Apple Community
On analyzing the Storage - 25GB is held by "Other" which is supposed to be System Logs , Cache etc. I am not able to reduce this. I have tried several times of resting erasing all contents , changed the Apple ID but of no use. I have tried to do rest through iTunes but it does not work. Asking to disable Find My Phone - Even after disabling iTunes gives the same error message. Any solution ? IoS Version is 14.8.1. I cant upgrade to 15 as there is no storage space 396 1
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BGR
bgr.com › tech › iphone-storage-almost-full-bug-plaguing-users-who-update-to-ios-15
'iPhone Storage Almost Full' Bug Plaguing Users Who Update To iOS 15 - BGR
December 27, 2022 - Apple released iOS 15 on Monday, but users have already discovered an annoying bug telling them that their storage is almost full.
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iPhone Tricks
iphonetricks.org › how-to-fix-iphone-storage-bug
How To Fix iPhone Storage Bug (Wrong Capacity In iOS 15)
October 14, 2021 - JD: “I updated to iOS 15.0.1 and my phone storage say zero kb of 256 gb used.” · Apple has failed to fix this bug in iOS 15.0.1 and iOS 15.0.2.
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discussions.apple.com › thread › 253242591
ios 15 showing incorrect storage - Apple Community
Actually, it can affect the iPhone’s overall performance: the erroneous "lack of storage" indication is preventing my iPhone from being able to save photo's or files to it - despite actually having significant available storage. ... I once thought that as well since I also went through that bug until I updated to iOS 15.1 and it was fixed (for me).
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VOI
voi.id › aktual › teknologi
How To Overcome The IOS 15 Bug That Makes System Data Large, Set For More Free Storage
You will see that the storage space on the menu is only 5GB in size and a maximum of 10GB. Users can also save new files on your device and the performance of your iPhone will return to normal because the storage space is no longer full. You also don't need to worry that it will delete the files on your device, because the Reset Location & Privacy menu serves to fix bugs in iOS 15.1.
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Apple Community
discussions.apple.com › thread › 253359080
IOS 15 storage bug? - Apple Community
Is anyone experiencing the same issue as mine? 362 1 · System Data in storage taking half the phones storage Hi guys, Just an observation I noticed after updating to ios 15 was that the system data is talking more than half of my phones storage space. There is no solution in how to reduce this used space and I’ve ended up removing more than half of my pictures and videos but to no effect.
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MacRumors
macrumors.com › 2021 › 09 › 22 › ios-15-iphone-storage-almost-full-alert
Some Users Plagued by Incorrect 'iPhone Storage Almost Full' Alert After Updating to iOS 15 - MacRumors
September 22, 2021 - A flood of users has taken to Twitter over the last 24-48 hours to share their experience that after updating to iOS 15, they see an "iPhone Storage Almost Full" warning inside of Settings, despite their ‌iPhone‌ having a sufficient amount of storage left. Apple Support's Twitter account is riddled with users reporting the bug.
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forums.appleinsider.com › discussion › 224115 › iphone-storage-almost-full-message-plaguing-some-ios-15-users
'iPhone storage almost full' message plaguing some iOS 15 users - iOS Discussions on AppleInsider Forums
Some early iOS 15 upgraders see "iPhone storage almost full" message regardless of storage used, and it cannot be dismissed. The error message appears no matter how much storage you have available The bug appears to affect a number of iPhone ...
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MacRumors
forums.macrumors.com › iphone, ipad, and ipod touch › ios and ipados › older ios versions › ios 15
iOS 15.1. "iPhone Storage Almost Full" notification is back! Unbelievable. | MacRumors Forums
October 25, 2021 - Previously my System Data was super high, like 30-40 GB. Now it's back to 0 and my iPhone storage is basically at what my iPhone 11 was before iOS 15 and my iPhone 13 Pro came along. Click to expand... System Data shouldn't be zero. ... My iPhone magically fixed itself from one day to the other on 15.1.
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iphonetricks.org › iphone-storage-almost-full-bug-ios-15
iOS 15 Bug: iPhone Storage Almost Full Notification (Fix?!)
October 14, 2021 - Workaround: In this case I recommend you to force quit Settings app, from the App Switcher and relaunch it! Update: Read here a couple of ways to fix the iPhone Storage bug that creates wrong capacity calculations!
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iPhone Life
iphonelife.com › how-to › device management
Fixed: Notification Says iPhone Storage Almost Full When It's Not
January 9, 2024 - Check your iPhone storage in the Settings app to confirm it is only a bug. If you are experiencing this glitch, you can carry on taking photos and downloading content without worrying about your storage. For every iPhone user, storage capacity is a common concern, but the “storage almost full” error began back in iOS 15.
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Apple Community
discussions.apple.com › thread › 253768402
iPhone storage full bug - again - anyone else? iOS 15.4
I updated To iOS 15 a couple of months ago with a few issues… one thing I noticed was how big the update was, I had to sync and complete the process via my laptop. However there wasn’t any storage warning back then. Since the newest update 15.4.1 my phone is showing a constant iPhone storage warning - but I have 10 gb (on a 64gb phone) which is more than I’ve had in months.
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Reddit
reddit.com › r/ios › ios 15: storage almost full bug - fix?
r/ios on Reddit: iOS 15: Storage almost full bug - fix?
September 5, 2021 -

I updated to iOS 15 a while ago and since updating I get this message that my storage is full (iPhone XS). I'm not really annoyed by that, but I also can't use WhatsApp on which I rely heavily on.

Did anyone find a fix for this issue. I've obviously tried to update to 15.1 and turning on and off my iPhone multiple times. Should I back up my iPhone and try to restore it from the backup

Top answer
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More info on my previous answer: There is no 'fix' for the 'Storage Bug' until Apple implements such fix in iOS and releases a solution in a new version in iOs. That said, there are 'workarounds' for the 'Storage' Bug. In each case, ie. each workaround case depends on what scenario you have. You will have to check what (scenario) you have (do you use icould?, do you have stuff/data in icloud that is synced to your iphone?, do you download your own music from iTunes via your computer to your ioS device? or use iTunes to sync/download your music directly from it's online service to your iphone? and the list of variables goes on and on an on.) What 'worked' for me was to setup the device as a 'brand new' device (eventhough I had a backup and was prompted in itunes if I wanted to 'restore' from the backup i just had made) and synced my data ie. synced 'Music' first, then when completed, synced 'Movies', then 'TV Shows', 'Books', etc, etc syncing 'one' at the time as I wanted to make sure, if the 'bug' repeated itself, that I woudl be able to determine which 'sync' Data Group (ie. Music, Books, TV Shows, Movies, etc) would cause the issue. After sycing all of my data, the 'storage' bug problem did NOT come back (as data had been 'uploaded' and not 'restored' from backup). This proces is way longer than just 'restoring from Backup' but worked for me. If you set up the device as a 'brand' new device, then your iphone (ios Device) will literally have all the space available. Then is just a matter to 'sync' your data again (ie. Music, Books, etc)... for this to work you must have your data on your computer and/or cloud and just opt to 'sync' each part (ie. sync 'Music' first, when completed, then sync 'Movies', then 'TV Shows', 'Books', etc, etc) always 'one at the time, so that you can control what is being synced to your device. Note: on a second device (iphone) which suffered the same storage bug phenomena, I set it up as a 'new' device, meaning I did NOT restore it from 'backup' instead of syncing my data 'one at the time' i opted to then sync, music, tv shows, movies, etc all at once and just clicked 'apply' in itunes after turning on the check mark in itunes to each of them and all worked well. Based on my experience, it seems that the 'restoring from backup' seems to be the trigger for the storage bug, which is a real bug in iOS.
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Apple Community
discussions.apple.com › thread › 253295052
Storage Bug - Apple Community
After updating to ios15, my iphone 11 is showing more storage then its actual storage. [Image Edited by Moderator to Remove Personal Information] ... Yes, there seems to be a bug in iOS 15. ... The update to iOS 15.1 should correct that. My iPhone 13 Pro showed that Zero KB of 512GB used.
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iToolab
itoolab.com › itunes › iphone-storage-full-bug
5 Tips to Fix iPhone Storage Full Bug When Update iOS 16
Step 1: Launch TunesPal, connect your device to computer and select iTunes Cleaner. Step 2: Get start to scan iTunes (The period depends on amount of data). Step 3: Select the documents you wish to remove and click the button of Clean. Just a few minutes, your iTunes will regain more storage. As usual, iOS 16 updating is a matter really needs your patient, especially when you are plagued by the wrong notice of ‘iPhone Storage Almost Full’. The same issue is happening in iPad also.
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Tenorshare
tenorshare.com › ios-14 › how-to-fix-ios-14-storage-bug.html
A Useful Guide to Fix iOS 17/16 Storage Bug
September 19, 2025 - Step 1 : Tap Settings > [your name]. Step 2 : Tap iCloud. Step 3 : Tap Manage Storage. Step 4 : Tap Messages, then tap Off. ... If you intend to solve the iOS 15 public beta storage bug on your Mac , kindly follow the procedures below: