Samsung phone does not see the flash drive: reasons and 10 working solutions

Have you connected a flash drive to Samsung Galaxy, but the phone does not see it? The problem occurs both on new flagships (Galaxy S23 Ultra, Z Fold 5) and on budget models (Galaxy A14, M33). The reasons may lie in Android settings, storage corruption, file system incompatibility, or hardware failures. In 80% of cases, the malfunction is eliminated using software methods - without visiting a service center.

In this article we will look all possible reasonswhy Samsung does not recognize a USB flash drive or memory card microSD, and also give step-by-step guide on diagnostics and repair. From simple actions (reboot, check contacts) to complex ones (changing the file system, resetting settings). We will pay special attention to the nuances of firmware One UI 5.0/6.0 and the specifics of working with exFAT/NTFS.

1. Checking the physical connection and contacts

Start with basic diagnostics - often the problem lies in mechanical damage or dirty connectors. If you use USB debugging or an adapter OTG, make sure that it is original (cheap Chinese adapters may not support USB 3.0).

For cards microSD:

• 🔍 Remove the card and inspect the contacts for scratches, oxidation or dirt. Wipe them with a soft cloth soaked in alcohol.
• 📱 Check memory card slot on your phone - dust often gets into it. Gently blow through the hole or use a toothpick (without pressing!).
• 🔄 Try inserting the card into another smartphone or PC adapter. If it is not readable there too, the problem is in the microSD.

For USB flash drives:

• 🔌 Connect the flash drive via another OTG adapter (preferably a branded one from Samsung). Cheap adapters may not provide sufficient power.
• 💻 Check the operation of the flash drive on your computer. If it is detected, but the phone does not see it, the problem is in the settings Android.
• 🔋 Make sure that the flash drive does not require additional power (some models with USB 3.0 may not work from a smartphone).

2. USB settings and connection modes

Samsung based One UI may block access to flash drives due to an incorrectly selected connection mode. By default, the system often sets the mode Charging, which does not allow reading external drives.

How to change the mode:

1. Connect the flash drive via OTGadapter.
2. Swipe down the notification panel and tap on the message USB for charging.
3. Select File transfer (File Transfer) or USB drive (USB Drive).
4. If there are no such options, go to Settings → Device care → Diagnostics → USB status.

For cards microSD:

• 📁 Go to Settings → Memory and check if it is displayed Is the card in the section Portable device.
• 🔄 If the card is detected but not mounted, tap on its name and select Extract, then insert it back.
• ⚙️ On some models (Galaxy S20+, Note 20), you need to manually enable the option Format as internal memory (but this will delete all data!).

3. Checking the file system of a flash drive

Android (including One UI from Samsung) does not support all file systems. If your flash drive is formatted in NTFS or HFS+, the phone will not see it. Optimal formats:

• FAT32 - compatible with all devices, but limited to files up to 4 GB.
• exFAT - supports large files, works on Android 6.0+ (including all current ones Galaxy).
• ext4 - only for internal memory (cards microSDformatted as internal).

Critical information: Flash drives with NTFS will not be recognized on Samsung without root access or special applications (for example, Paragon NTFS). If there is important data on the drive, first copy it to a PC, then format it in exFAT.

How to check the file system on a PC:

1. Connect the USB flash drive to the computer.
2. Open This computer (My computer, right-click on the flash drive → Properties.
3. B line File system The current format will be indicated.

Format	Samsung compatibility	Max. file size	Recommendation
FAT32	✅ Yes	4 GB	For flash drives up to 32 GB
exFAT	✅ Yes (Android 6.0+)	16 EB	Optimal for large files
NTFS	❌ No (no root)	16 EB	Requires application or root
ext4	⚠️ Only for internal memory	16 EB	Not suitable for removable drives

How to format a flash drive in exFAT without losing data?

Unfortunately, formatting always deletes data. First, copy the files to your PC, then format the flash drive via This computer → RMB on the disk → Format. Select exFAT and click Start.

4. Software update and reset settings

If the flash drive previously worked, but Suddenly is no longer detected, the problem may be in the firmware. Samsung regularly releases updates for One UIthat correct errors with USB OTG i microSD. Check the software is up to date:

1. Go to Settings → Software update.
2. Tap Download and install.
3. If the update is available, install it and reboot phone.

If the update does not help, run Reset USB settings (does not delete data):

1. Open Settings → General → Reset.
2. Select Reset USB settings (on some models the item is called Reset network settings).
3. Confirm the action and reboot the device.

⚠️ Attention: On models Galaxy S22 and newer reset USB settings may require you to enter a PIN code from your account Samsung. Make sure you remember the password!

If the problem persists, try reset all settings (does not delete files, but resets Wi-Fi, Bluetooth, etc.):

• 🔄 Go to Settings → General → Reset → Reset settings.
• 📱 After rebooting, check the operation of the flash drive.

5. Checking for viruses and damage to the flash drive. data-i="182">My files

Viruses or damaged sectors on a flash drive can block its mounting in Android. If your phone makes a connection sound, but the drive does not appear in My files, follow these steps:

Scan for viruses:

• 🛡️ Install an antivirus (for example, Malwarebytes or Dr.Web Light).
• 🔍 Connect a flash drive and scan it.
• 🗑️ If threats are found, remove them and reboot the phone.

Checking for errors (on PC):

1. Connect the flash drive to the computer.
2. Open Command line as administrator.
3. Enter the command (replace X: with the letter of your flash drive):

   chkdsk X: /f /r

4. Wait until the check is completed and remove the flash drive safely.

⚠️ Attention: If chkdsk finds errors, but cannot fix them, the flash drive is damaged. Try restoring data using Recuva or TestDisk, then format the drive.

6. Using third-party applications

If standard methods do not help, try specialized utilities for working with external drives. They can bypass restrictions Android and forcibly mount a flash drive.

Top 3 applications for Samsung:

• 📁 USB OTG Checker - checks support for OTG your device and tests connected drives.
• 🔧 Total Commander - file manager with support NTFS (requires a plugin).
• 💾 Paragon NTFS & HFS+ - allows you to read/write on NTFSflash drives without root access (paid, but there is a trial period).

Instructions for Total Commander:

1. Install the application from Google Play.
2. Connect the flash drive via OTG.
3. In the main menu, select Plugins → Install Plugins and install NTFS Plugin.
4. Restart the application - the flash drive should appear in the list devices.

☑️ Checklist before contacting the service

Try another OTG adapterTest the flash drive on a PCUpdate the phone firmwareCheck file systemReset USB settings

Done: 0 / 5

7. Hardware faults and service center

If none of the methods worked, the problem may be in the hardware:

• 🔌 The connector is damaged USB-C - a common problem after falls or moisture. Check if the connector is wobbly when connecting the cable.
• 📱 The memory controller is faulty —if the phone does not see any flash drives and cards microSD, the chip responsible for working with external drives may have failed.
• 🔋 Power problems —some flash drives require more energy than a smartphone can provide via OTG.

How to diagnose a hardware fault:

• 🔍 Connect a known working flash drive via another OTG adapter.
• 📱 Check whether the flash drive is detected in Settings → Memory (even if it is not visible in the file manager).
• 🔧 If the phone does not respond to any external drives - contact the service center Samsung.

⚠️ Attention: Independent repair of the connector USB-C or motherboard may lead to loss of warranty. On models Galaxy S/Note 2020+, the connector is often soldered to the board - replacing it requires soldering equipment.

The cost of repairs in official service centers Samsung (as of 2026 year):

Type of repair	Cost (₽)	Term (days)
Replacement of connector USB-C	2 500 — 4 000	1–2
Diagnostics of the memory controller	1 000 — 1 500	1
Motherboard repair	from 5,000	3–7

8. Alternative methods of data transfer

If it was not possible to restore the flash drive, use alternative methods of transferring files:

Wireless:

• ☁️ Cloud storage (Google Drive, Samsung Cloud) - download the files to your PC, then download them to your phone.
• 📶 FTP server —use applications like FX File Explorer to create a local server.
• 🔗 Send Anywhere — transfer files via a direct link without registration.

By cable:

• 🖥️ Connect the phone to the PC via USB and copy the files manually (select mode Transfer files).
• 🔌 Use card reader for microSD —connect it directly to the computer.

💡

If the flash drive is detected on the PC, but not on the phone, the problem is in the Android settings or hardware incompatibility. If it is not detected anywhere, the drive is damaged.

FAQ: Frequently asked questions about flash drives on Samsung

❓ Why does the phone see the flash drive, but does not open the files?

Most likely, the file system is damaged or the flash drive is formatted in NTFS. Connect it to your PC, copy the data and format it to exFAT. Also check the flash drive for viruses.

❓ Can I use a flash drive as internal memory on Samsung?

Yes, but only cards microSD (not USB flash drives). To do this, select Set up as internal storagewhen connecting for the first time. Please note that after this the card cannot be read on other devices without formatting.

❓ Why does the OTG adapter not work?

Reasons: 1) Cheap, uncertified adapter; 2) Lack of power (try an external power adapter); 3) The connector USB-C in the phone is damaged. Also check if your model supports Samsung OTG (all devices on One UI support).

❓ How to recover data from an unreadable flash drive?

Use apps Recuva (Windows) or DiskDigger (Android). If the flash drive is physically damaged, contact a data recovery laboratory. Do not format it before recovery!

❓ Why doesn’t Samsung see the flash drive after the update?

The update One UI could reset settings USB or change security policies. Try resetting USB settings (Settings → General → Reset) or rollback the firmware via Smart Switch (if available).