If you have ever opened iPhone Storage and been shocked by a huge grey "System Data" bar, you are not alone. System Data — formerly called "Other" — holds caches, logs, Spotlight indexes, Siri voices, fonts, and other temporary files iOS uses to run smoothly. Apple says much of it is managed automatically, so there is no single button to delete it. What you can do is shrink its sources, one by one.
Start by checking the real numbers: Settings > General > iPhone Storage. Wait for the list to finish calculating, then look at System Data and your three largest apps. On a 128 GB iPhone, 20 GB of System Data is about 15.6% of total capacity; on a 64 GB model, 15 GB is already 23.4%. That is why smaller iPhones feel full so much faster.
Then work through the steps in order. First, clear Safari's history and website data (Settings > Apps > Safari). You may need to sign in to some sites again, but your photos and messages are untouched. Second, tidy up Messages: check Settings > General > iPhone Storage > Messages for the biggest conversations and attachments, save anything you want to keep, and set messages to auto-delete after 30 days or one year instead of forever.
Third, offload apps you rarely open. Offloading removes the app but keeps its data, so reinstalling restores it — unlike deleting, which removes both. Fourth, clean streaming-app caches one app at a time. iPhones have no "clear all cache" button, so use each app's own clear-cache setting where available, or delete and reinstall the app (after making sure playlists and downloads are synced to your account).
Fifth, restart the phone and update iOS if space allows; a restart lets iOS recalculate storage and drop temporary files, and syncing with a Mac or PC can trigger further cleanup of old logs. Only as a last resort, back up the phone, verify the backup is complete, erase all content, and restore. Never erase without a verified backup — the space you gain is never worth lost photos and chats.
Finally, skip the viral tricks. No third-party "cleaner" app can reach iOS system files by design, so those apps cannot truly clean System Data. Build the habits instead: automatic offloading, limited message retention, and moving old photos off the phone before it fills up. The full step-by-step guide with the complete checklist is on my blog: https://www.miftahulrizki.eu.org/2026/10/cara-mengurangi-penyimpanan-sistem-di.html — and if your iCloud storage is also full, this iCloud cleanup guide pairs with it: https://www.miftahulrizki.eu.org/2026/10/cara-mengatasi-penyimpanan-icloud-penuh.html
Top comments (0)