Your Samsung Recovery screen shows "fail to open recovery_cause (No such file or directory)" near the bottom, followed by lines such as "Reboot Recovery Cause is [UNKNOWN]" . If the Recovery menu is visible, Recovery Mode has already opened. This line does not by itself mean that the recovery partition, motherboard, or personal data has failed. The message says that Samsung's recovery environment could not read an expected record describing why the device entered Recovery. The decision changes with what happens next: a Galaxy that reboots into Android and works normally is different from one that keeps returning to Recovery or also shows mount and verification failures. Do not factory-reset a working phone merely to remove this diagnostic line. First read the other lines on the screen, choose Reboot system now if no destructive action is intended, and judge the phone by whether it boots, unlocks, reads files, and stays stable. Photo by Mark Chan o...
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Samsung USB Storage Device Removed Unsafely? Clear the Cache Without Erasing Files
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Your Samsung phone says "USB storage device was removed unsafely," even though the drive is still connected or you did not unplug anything. First, stop copying files and do not repeatedly reconnect the drive. If an external drive is visible in My Files, unmount it before touching the cable.
If the warning remains after the drive is safely removed, restart the phone and clear the USBSettings cache. Clearing this cache removes temporary USB state, not your photos, downloads, or files on the external drive. Clearing app data is a separate, stronger reset and should not be the first tap.
A warning that disappears after this sequence usually points to a stale USB session. A warning that returns with different cables or appears while the port is empty needs a closer check for moisture, debris, a loose connector, or port damage.
Protect the files first: if My Files shows USB storage and a copy or backup may still be running, wait for it to finish and use Unmount. A disappearing notification is less important than avoiding an interrupted write.
What Does the Unsafe USB Removal Message Actually Mean?
The message means Android believes an external USB storage session ended without a completed unmount. It can reflect a real disconnect during file access or an outdated USB state that survived after the drive was removed; the notification alone cannot prove that files are damaged or that the charging port needs replacement.
The distinction matters because the same words can appear in two very different moments. One person has just pulled out a USB-C flash drive while a video was copying. Another sees the message after unlocking the phone even though no drive is attached. The first situation calls for checking the drive and copied files. The second points more strongly toward a stuck USB service, intermittent cable contact, or port detection problem.
Samsung documents the exact warning in its Portable SSD troubleshooting guide. In that product-specific case, the message can appear when the Portable SSD mobile app starts as part of the SSD's security behavior. That exception is easy to miss: the notification can be generated by how a particular storage product reconnects, not only by someone physically yanking out a drive.
What happened just before the message
Most useful first check
Main risk
A drive was unplugged during a copy, move, backup, or recording
Reconnect once, inspect the destination files, then unmount correctly
An incomplete file or damaged file system
The warning appeared after a normal disconnect
Restart, then clear USBSettings cache if it returns
Usually a stale USB state rather than immediate file loss
The cable or OTG adapter moves easily
Stop transfers and test one known-good cable or adapter
Repeated connect-disconnect cycles during writes
Nothing is connected, but USB notices keep returning
Inspect for moisture or debris, clear USBSettings cache, and run diagnostics
Contamination, moisture, or a port fault
Do not use the notification timestamp as proof that the unsafe removal happened at that exact moment. A delayed system notice can make the cable you are currently using look guilty when the interrupted session occurred earlier.
What Should You Do Before Clearing the USB Cache?
Before clearing anything, confirm whether a flash drive, SSD, card reader, camera, or USB hub is still mounted. If USB Storage appears in My Files, finish or cancel active file work, wait until the drive is idle, and choose Unmount; the exact menu can vary by One UI version and device.
Leave the drive connected for the moment. Open My Files and look for USB Storage under the storage section.
Check active work. Confirm that Move, Copy, Smart Switch, backup, camera import, or an app writing to the drive has finished.
Unmount from My Files. Tap the More options icon beside the external storage entry, then tap Unmount. Wait for the storage entry or confirmation to disappear.
Disconnect without twisting the plug. Hold the connector or adapter, not the cable, and pull it straight out.
Check the last files copied. Open important destination files and compare their sizes where possible. Do not immediately format a drive merely because the warning appeared.
Samsung's Galaxy backup and restore guide gives the same safe-removal sequence: after transferring files, open My Files, use the options beside the external device, tap Unmount, and then disconnect it. This is the step that protects data; clearing a notification afterward does not complete an interrupted write retroactively.
If the drive is not recognized after the unsafe removal, test it on one trusted computer or another compatible device before changing its file system. A format prompt means the device cannot currently read the existing structure; formatting can erase access to the files you are trying to protect.
With a Samsung Portable SSD, also consider whether the SSD app, encryption unlock, or a required permission is reconnecting the drive. Follow the model's own support instructions before treating its security behavior as a Galaxy port defect.
How Do You Clear the Samsung USBSettings Cache?
On most recent Galaxy phones, open Settings, show system apps, select USBSettings, and clear its cache. Menu labels can differ across One UI versions, and some models may not expose USBSettings by the same name; clearing the cache is the low-risk first reset because it removes temporary app files rather than personal storage.
Disconnect external USB storage after it has been safely unmounted.
Open Settings > Apps.
Tap the Filter and sort icon beside the app list.
Turn on Show system apps, then tap OK or Done.
Search for USBSettings or scroll to it.
Open Storage, then tap Clear cache.
Restart the Galaxy phone and reconnect the drive once.
Samsung's general cache and app-data guide separates these two buttons. Clear cache removes residual temporary files. Clear data resets the selected app to its defaults and can remove settings or data stored by that app. That is why this troubleshooting order starts with cache, tests the connection, and does not casually tell the reader to clear every data button on the screen.
What should change: after the restart, connect one known-good drive or cable and leave it still. A stable USB Storage entry without repeated disconnect notices is a better success signal than simply swiping the old notification away.
If USBSettings is absent, do not clear unrelated system apps by guesswork. Restart first, install pending Galaxy system updates, and use Samsung Members diagnostics or Samsung Support for the exact model. Search results often compress "clear USB cache" into one tap, but the difficult part is selecting the correct system component and testing only one variable afterward.
AndroidFixLab at www.androidfixlab.com uses this cache-first sequence because it preserves the evidence needed to tell a stale software state from an unstable physical connection.
How Can You Tell a Stale USB State From a Cable or Port Fault?
A stale USB state usually clears after safe unmount, restart, and USBSettings cache clearing, then stays gone with a stable known-good connection. A hardware or connection problem is more likely when the notification returns as the plug moves, multiple data-capable cables fail, moisture or debris is visible, or USB notices appear with an empty port.
Run one controlled test instead of swapping several parts at once:
Remove a case that prevents the USB-C plug from seating fully.
Inspect the cable ends and phone port in bright light without inserting metal tools.
Try one known-good data cable, not a charge-only cable.
Connect directly to the phone rather than through a hub or loose OTG chain.
Keep the phone and cable still while opening My Files or the USB notification.
Test the same drive elsewhere and a different compatible drive on the phone.
Samsung's USB cable troubleshooting page tells users to check for moisture, cable damage, case interference, and a different cable. Those checks are useful because a connector can provide charging power while its data contacts remain unreliable. If the phone charges but a computer never sees it, use the Samsung USB-C data-transfer checklist instead of repeating this storage-warning sequence.
Moisture is a separate branch. If the Galaxy also shows a moisture or foreign-material warning, stop wired charging and follow the moisture-warning check after drying. Clearing USBSettings must not be used to bypass a real wet-port warning.
Movement is the most revealing test. If a stationary plug is stable but a small touch triggers connected-disconnected notices, the problem is unlikely to be solved permanently by another cache clear. A worn cable, packed debris, damaged adapter, or loose port can interrupt storage while a file is being written.
When Does the Warning Justify a Repair Inspection?
Book an inspection when the unsafe-removal warning returns with the port empty, recurs with more than one verified data cable or drive, follows liquid or impact exposure, or accompanies looseness, corrosion, heat, burning smell, or unreliable charging. The repair decision still depends on diagnosis; a recurring notification does not by itself prove the USB-C port assembly must be replaced.
Stop home testing immediately if the port becomes hot, looks burned, smells unusual, or the connector must be held at an angle. Back up over Wi-Fi or cloud while the phone remains stable. Repeatedly forcing a cable into a damaged port can turn an intermittent data problem into loss of both charging and data access.
Before service, record a short video showing whether the warning appears with no accessory attached and whether gentle cable movement changes the status. Bring the cable, adapter, and drive that reproduce the problem. A technician can then separate phone-port damage from an accessory fault without relying on a vague "USB sometimes fails" description.
Ask for the diagnosis before approving a part:
Was contamination removed, or is the connector physically loose or corroded?
Does the phone pass charging and USB data tests with a service cable?
Is the USB-C port a separate replaceable part on this model or part of a larger board assembly?
Does the estimate include labor, sealing, testing, tax, and repair warranty?
Can the repair affect stored data, and should the phone be reset during diagnosis?
If replacement is proposed, compare the written estimate with the Samsung USB-C port repair cost guide. Cleaning, sub-board replacement, microsoldering, and motherboard work are not interchangeable quotes, and their data risk and price can differ.
FAQ
Will clearing USBSettings cache erase my photos or USB drive files?
No. Clearing the USBSettings cache removes temporary system-app files, not photos, downloads, or files stored on the USB drive. Clear data is a different reset, and formatting the external drive can erase files, so do not confuse those actions.
Why does Samsung show the warning when no USB drive is connected?
The phone may be retaining a stale USB session or repeatedly detecting a connection because of moisture, debris, a loose port, or another USB component. Restart and clear USBSettings cache, then inspect an empty port if the notice returns.
Should I reconnect the drive after an unsafe removal warning?
Reconnect it once only if you need to verify an interrupted transfer or unmount it correctly. Check important copied files before starting another large transfer, and avoid repeated reconnects when the cable or port is unstable.
Why can my Samsung charge but not keep USB storage connected?
Charging and USB data use different contacts and connection modes. A charge-only cable, damaged data contacts, a loose OTG adapter, a blocked USB mode, or port wear can allow power while storage disconnects.
Do I need a factory reset for this USB notification?
Usually not as a first response. Safe unmount, restart, USBSettings cache clearing, cable testing, port inspection, updates, and Samsung diagnostics should come first; a factory reset erases personal data and cannot repair physical connector damage.
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