ASUS's article for an Insufficient Storage message points to Storage Sense, a Microsoft tool that automatically frees space by deleting items you do not need, such as temporary files and items in the Recycle Bin. It works on the system drive, usually C:, and you choose when it runs (every day, week, month or when free space is low), whether to delete files in Downloads that have not been opened for a set time and whether to clear the Recycle Bin. Its cleanup categories include temporary files, large or unused files and files synced to the cloud, and you can run it immediately.
Thin ASUS laptops have one soldered or M.2 drive, and the ROG Ally X has a standard M.2 2280 SSD that is physically replaceable, so a handheld can be upgraded where a Zenbook cannot.
Differential
Likely causes of “ASUS laptops storage is full or nearly full”, and how to tell them apart
- 1
Temporary files and the Recycle Bin
What separates it The drive is nearly full after updates and downloads
How to confirm ASUS says Storage Sense deletes temporary files and Recycle Bin items you do not need
- 2
Old downloads
What separates it The Downloads folder holds gigabytes because of old downloads
How to confirm Storage Sense can delete files in Downloads that have not been opened for a chosen period; check first
- 3
Large or unused files and apps
What separates it A few apps and videos dominate the drive because of large or unused files and apps
How to confirm Settings, System, Storage lists large files; move them to an external drive or delete them
- 4
Files synced to the cloud
What separates it OneDrive files use local space because of files synced to the cloud
How to confirm ASUS lists files synced to the cloud as a Storage Sense category; make them online-only
- 5
A small drive
What separates it The drive fills up again within a few weeks of a cleanup and the warnings return
How to confirm Use an external SSD or cloud storage; the ROG Ally X's M.2 SSD can be replaced
Before you touch a setting
Record this first — changing settings destroys the evidence
- Which ASUS machine you have, its drive size and free space on C:
- The largest categories in Settings, System, Storage
- Whether Storage Sense is on and how it is set
- The exact insufficient storage message that Windows shows
Try in this order
0 of 7 completedOpen Storage settings
ReversibleOpen Storage settings, in Settings, System, Storage, and see what is largest on the drive.
Run Storage Sense
ReversibleTurn Storage Sense on and run it now to delete temporary files and Recycle Bin items.
Set the schedule
ReversibleChoose how often it runs and how long files sit in Downloads and the Recycle Bin before deletion.
Move big files
ReversibleCopy videos and project folders to an external drive, check them, then delete the originals.
Remove unused apps
ReversibleRemove unused apps, by uninstalling apps that you no longer use, and check the space again.
Make cloud files online-only
ReversibleMake cloud files online only, to free local space that is held by synced files.
Restart and check
ReversibleRestart and check, by restarting and confirming that free space has risen before updating, and then test again to see whether it helped.
Model-specific
What is true of this model and not of its siblings
- Drives by model
- Zenbook S14: 1 TB PCIe Gen 4 SSD option. ROG Ally X: 1 TB M.2 2280 SSD, replaceable. Others vary by configuration.
- What to clear first
- Temporary files and the Recycle Bin, then old downloads, then large files and unused apps, following ASUS's Storage Sense options.
- Repair cost
- Freeing space costs nothing. A larger drive at an independent shop is $99 to $179 per BadgerLayer's 2026 PC repair guide, and data recovery from a failed drive starts at $149, per BadgerLayer's 2026 laptop repair guide.
- Other models this page answers
- These steps also fit the ProArt P16 H7606, Vivobook S 15 S5507.
Stop boundary
When this stops being a self-service repair
- !If space is not freed after Storage Sense and moving files, run MyASUS diagnostics on the drive and contact ASUS
- !If diagnostics show drive errors, back up and contact an ASUS service center
- !If you keep running out of space, plan an external SSD or cloud storage
Evidence ledger
Sources behind this answer
Storage Sense schedule, Downloads and Recycle Bin clean-up, temporary and large files.
Free space and updates.
The Zenbook premium ultrabook line.
The Vivobook mainstream laptop line.
The ROG Ally handheld gaming PC line.
Exact questions
Common questions
What is the safest first thing to delete?+
Empty the Recycle Bin and run Storage Sense in Settings, System, Storage, which removes temporary files Windows itself marks as safe. Personal files stay untouched, so that is a lower-risk start than manual deleting.
Does the ROG Ally X fill up faster because of games?+
It can. Large game installs take most of the storage, so check the size of each game under Settings, Apps and uninstall the ones you no longer play; reinstalling from the store restores them later.
What is Storage Sense?+
ASUS describes it as a Microsoft tool that automatically frees up space by deleting items you do not need, such as temporary files or items in the Recycle Bin.
Does Storage Sense clean other drives?+
ASUS says it works on the system drive only, usually C:; ASUS's article covers other drives separately in the Storage settings.
Can it delete my downloads?+
Yes, if you set it to delete files in Downloads that have not been opened for a chosen period. Check the setting before enabling it.
Can I upgrade the Ally X drive?+
The catalog lists a standard M.2 2280 SSD in the ROG Ally X, which is a physically replaceable size unlike most ultra-thin laptop drives.
Can I upgrade a Zenbook drive?+
Check your model's manual. Thin ultrabooks such as the Zenbook S14 often use a fixed drive; use an external SSD or cloud storage as overflow.
Will cleaning fix a slow machine?+
It can, if the drive was nearly full. ASUS's slow-system article also lists memory and drive type.
Do I need a part number for a bigger drive?+
No. ASUS identifies the machine by model and serial number.