The internal memory capacity of modern smartphones is often insufficient to store a huge archive of media files. The gallery quickly fills up with high-resolution photos, 4K videos and screenshots, resulting in system slowdowns and the inability to install new applications. The most effective solution to this problem is physical archiving of data to an external drive.
Transferring photos from an operating system Android to a regular one USB flash drive allows you to free up gigabytes of space without using cloud services that require a subscription or stable Internet. This method gives you complete control over your data and ensures its safety even when you reset your phone to factory settings. The copying process has become much easier with the advent of technology support USB OTG in most mobile devices.
In this article we will analyze in detail all the necessary steps: from choosing the right equipment to working with file managers. You will learn how to properly connect a drive, what file system formats are supported, and how to avoid common mistakes when transferring large amounts of information. The instructions are relevant for most modern models of smartphones and tablets.
Preparing equipment and checking compatibility
Before starting the procedure, you need to make sure that your mobile device has the technical ability to work with external drives. The key element here is support for the standard USB On-The-Go (OTG). This technology allows the smartphone to act as a host and supply power to connected peripherals such as flash drives, mice or keyboards.
Most phones released after 2015 already have built-in OTG support at the hardware and operating system level. However, some manufacturers, for example Oppo, Vivo or Realme, can programmatically disable this feature to save energy. In such cases, the user will need to manually activate the mode in the settings before the phone sees the connected drive.
For the physical connection, you will need a special adapter known as OTG cable. It has a connector micro-USB or USB Type-C on one side (for connecting to a phone) and a full port USB-A on the other (for inserting a flash drive). There are also universal flash drives equipped with two connectors at once, which eliminates the need to use extra wires.
Check the specifications of your smartphone on the manufacturer’s official website to make sure it supports USB OTG. Usually this information is located in the “Technical Specifications” or “Connections” section.
⚠️ Attention: Do not try to connect a flash drive through homemade adapters or damaged cables. Unstable voltage can damage the smartphone's power controller or lead to data loss on the drive.
- 🔌 Make sure that the phone's charging connector is clean and free of dust or lint.
- 💾 Check that there is enough free space on the flash drive for all photos.
- 🔋 Charge your smartphone to at least 30-40%, since the data transfer process consumes energy.
Formatting the drive into a compatible file system
The operating system Android has restrictions on reading certain file systems. By default, many flash drives come with a format NTFSthat is native to Windows, but is often not supported by mobile devices without obtaining superuser rights (root). For trouble-free operation, it is recommended to use the file system FAT32 or exFAT.
Format FAT32 is the most compatible and can be read by almost any device, including older models of phones, radios and TVs. However, it has a significant drawback: it does not support recording individual files larger than 4 GB. If you plan to transfer long videos in high quality, this option may not be suitable.
A more modern solution is the file system exFAT. It has no file size restrictions and works great with modern versions of Android (from 6.0 and above). Before use, it is best to format a new flash drive directly through the smartphone settings so that the system itself selects the optimal parameters.
Settings → Storage → USB drive → Clear and formatPlease note that the formatting procedure completely deletes all data from the media. If there are already important files on the flash drive, first copy them to your computer. After formatting is complete, the system will assign a name to the drive and make it writable.
Why does the phone not see the flash drive after formatting?
If after formatting the device still does not appear, there may be a problem with the file system. Try formatting the flash drive on your computer in FAT32 format using third-party utilities such as Rufus or HDD Low Level Format Tool, since the standard Windows tool may not offer this option for volumes larger than 32 GB.
Connection process and access settings
After preparing the equipment and media, you can begin direct connection. Connect the flash drive to your smartphone via an OTG adapter. In most cases, the system will automatically recognize the device and send a notification to the notification shade with the text “USB drive connected.”
If automatic recognition does not occur, check the connection settings. In some shells, such as MIUI or ColorOS, you need to go to the Additional settings section and find the item USB connection. Here you need to switch the operating mode from “Charging only” to “File transfer” or “USB storage”.
To access the contents of the flash drive, open the standard “Files” or “File Manager” application. In the list of available storages, in addition to “Internal memory” and “SD card”, a new section should appear with the name of your USB device. By clicking on it, you will see the root directory of the drive.
☑️ Connection algorithm
| Parameter | FAT32 | exFAT | NTFS |
|---|---|---|---|
| Android support | Full | Full (Android 6+) | Partial / Root required |
| Max. file size | 4 GB | No restrictions | No restrictions |
| PC compatibility | High | High | High (Windows) |
| Recommendation | For photos and documents | For videos and archives | Not recommended |
Copying photos through a file manager
The most reliable way to transfer images is to use a built-in or third-party file manager. Open the app and go to internal storage. You need to find the folder where the pictures are stored. Usually this is a directory DCIM, and inside it there is a folder Camera.
Select the desired photos by long pressing on one of them. After this, a toolbar will appear, allowing you to select all files at once or mark specific images using checkboxes. For bulk transfer, it is convenient to use the “Select All” function in the action menu.
After selecting the files, click the “Copy” or “Move” button. The difference between these actions is that copying creates a duplicate of the files on the flash drive, leaving the originals in the phone's memory, while moving deletes them from the source. To create a backup, it is safer to select the operation Copy.
Now go to the USB drive section. Select a target folder or create a new one by clicking on the plus folder icon and giving it a meaningful name, such as Backup_Photos_2026. In the new folder, click the "Insert" button. The process will begin automatically and a progress bar will appear on the screen.
When copying thousands of small photos, the process may take a significant amount of time. Do not disconnect the flash drive until the operation is complete, even if the progress indicator has disappeared, it is better to wait for the notification of successful extraction.
⚠️ Attention: When moving a large number of files, do not lock the smartphone screen or launch heavy applications. This can slow down the memory controller and cause the recording process to freeze.
Using specialized applications
If the standard Explorer seems inconvenient to you or does not display some types of files, you can use third-party software. The leader in this category is the application Files by Google, which offers a user-friendly interface and smart sorting of media files by date and type.
Another powerful tool is the manager Solid Explorer. It supports working with two panels simultaneously, which makes the process of dragging files between internal memory and a flash drive as visual as possible. You simply open one panel for the source, another for the destination and drag and drop files.
For users who require automation, there are applications like FolderSync. They allow you to set up a schedule according to which the phone will independently copy new photos from the camera folder to a connected flash drive when it is detected. This eliminates the need to perform routine steps manually.
- 📱 Files by Google —an excellent solution for cleaning up garbage and quick sorting.
- 📂 Solid Explorer —the best choice for advanced users with archive support.
- 🔄 FolderSync —ideal for automatically creating backups on a schedule.
Safe extraction and problem solving
The final and critical stage is to properly disconnect the drive. Never unplug the flash drive from the connector immediately after copying is complete. There may be data in the system cache that has not yet been physically written to the media, and a sudden loss of power will lead to its loss or damage to the file table.
To safely remove the device, lower the notification shade. There you will find a notification about working with the USB drive. Click the button Eject or the triangle with arrow icon. Wait for the “Safely Removal Complete” message or the notification to disappear, and only then physically disconnect the cable.
If errors occur during operation, for example, the message “File not copied” or “Write error,” check the free space on the flash drive. A damaged memory sector may also be the cause. In this case, try copying the files in smaller portions or scanning the drive on your computer using the utility chkdsk.
What to do if files are copied but disappear after a reboot?
This is a sure sign that the flash drive has a fake capacity or is faulty. Such drives are often sold on marketplaces under the guise of large amounts of memory. Check the actual capacity using the h3testw app on your PC.
⚠️ Attention: Settings interfaces and menu item names may differ depending on the version of Android and the manufacturer’s shell (Samsung One UI, Xiaomi MIUI, etc.). If you do not find the described item, use the search inside the phone settings.
Frequently asked questions (FAQ)
Is it possible to charge the phone through a connected flash drive?
No, in normal mode it works in host mode (OTG) assumes that the phone itself powers the flash drive. Simultaneous charging of the phone through the same port is impossible without the use of special splitters with external power, which are rare and work unstable.
Why are videos in HEIC format not copied to a flash drive?
The format HEIC is the property of Apple and may have limitations on some Android devices. If copying fails, try switching the saving format to a more universal one in the smartphone camera settings JPEG before shooting or convert the files before transferring.
How long does it take to transfer 10 GB of photos?
The time depends on the recording speed of the flash drive (speed class) and the USB interface of your phone. For a regular USB 2.0 flash drive, this may take from 15 to 30 minutes. Modern USB 3.0 drives and Type-C ports will cope with this task in 2-5 minutes.
Is it possible to run applications directly from a flash drive?
The Android operating system does not allow you to install and run full-fledged applications directly from an external USB drive for reasons of security and stability. The flash drive is intended only for storing user data: photos, videos, documents.
What to do if the phone says “USB device is not supported”?
This message means that either your phone does not support OTG technology, or the flash drive is formatted with an incompatible file system (for example, NTFS). Try reformatting the drive to FAT32 or exFAT. If this does not help, there is probably no hardware support for OTG in your model.