Owners of mobile devices are often faced with a lack of space to store photos, videos and applications. Over time, the drive becomes clogged with system garbage, cache and outdated files, which leads to slowdown of the smartphone. When standard cleaning no longer helps, a radical solution is to completely repartition the drive. Android-smartphone. When standard cleaning no longer helps, a radical solution is to completely repartition the drive.
The formatting procedure returns the disk to its original state, deleting the entire file structure and data. This not only frees up gigabytes of space, but also eliminates logical errors that may prevent the system from seeing the memory card or displaying messages about file corruption. However, before starting the procedure, you need to understand the risks of losing information.
Correct completion of all steps ensures that your device will operate stably, and the speed of writing and reading data will be restored to factory settings. We will analyze all available methods: from standard system settings to using a computer and console utilities.
Preparing the device for the formatting procedure
Before taking active steps, it is critically important to save all valuable data. Formatting completely destroys information on the selected media, and it will be impossible to restore it using standard means. Transfer photos, contacts and documents to cloud storage or computer.
⚠️ Attention: Make sure the battery level is at least 50%. A sudden power outage while repartitioning the file system can lead to irreversible damage to the memory controller.
If you plan to format the external card microSD, remove it and insert it back until it clicks to make sure the contact is secure. A bad connection can cause an error in the middle of the process, making the card unreadable. For internal memory, make sure that there are no heavy applications running on the phone.
It is also recommended to disable Find My Device or unlock the lock screen if the system requires confirmation of administrator rights. Some models Samsung or Xiaomi may require you to enter a PIN code or pattern before starting critical memory operations.
☑️ Preparing for formatting
Format through Android system settings
The safest and easiest way to clean a drive is to use the built-in tools of the operating system. The interface may differ slightly depending on the manufacturer's shell, but the logic of action remains the same for all versions Android from 6.0 and higher.
Go to the settings menu and find the section responsible for memory. It is usually called "Storage", "Memory" or "Device and Memory". Here you will see a list of available drives: internal memory and SD card, if installed.
Click on the name of the desired drive. In the menu that opens, find the three dots in the upper corner or the “Advanced” button. In the drop-down list, select “Storage Settings” or immediately “Format”. The system will warn you about data loss again.
- 📱 Click the "Empty and Format" button to confirm.
- ⏳ Wait for the process to complete, which may take from 30 seconds to several minutes.
- ✅ After successful completion, the system will offer to use the disk as portable storage or internal memory.
If the system prompts you to select the type of use after formatting, select “Internal memory” only if the card is very fast (class U3/A2), otherwise the phone interface will start to slow down.
It is important to note that when you select the “Internal memory” mode, the card is encrypted and tied to a specific device. It will not be possible to transfer such a card to another phone without losing data, since the encryption keys unique for each gadget.
Using the Adoptable Storage mode
Starting with version Android 6.0 Marshmallow, the Adoptable Storage function has appeared, allowing you to combine the internal memory of the phone and the microSD card into a single space. This is convenient, but has its own technical features that need to be taken into account before formatting.
When you format a card as internal memory, the system creates an encrypted partition on it. All new applications and data will be written to this drive by default. The speed of the smartphone in this case directly depends on the speed class of your memory card.
⚠️ Attention: Do not remove a card formatted as internal memory without first transferring the data back. This will crash applications installed on this drive.
If you decide to return the card to portable storage mode, it will have to be formatted again. To do this, go to the storage settings, select the card and click “Format as portable storage.” The system will delete all applications and data from it.
Why do some phones not see this function?
Manufacturers often hide the ability to format both internal memory in the firmware so that users buy models with a large amount of built-in storage. This is especially typical for the Samsung and LG brands.
Using this mode makes sense only if you have a high-end card, for example SanDisk Extreme or Samsung EVO Plus. Cheap cards with low write speeds will turn your fast smartphone into a slow device with long app launch times.
Format via a computer and card reader
Sometimes the built-in Android tools do not cope with the task, especially if the file system of the card is damaged or has a non-standard format. In such cases, a computer with an operating system comes to the rescue Windows or macOS.
Connect the phone to the PC in file transfer mode (MTP) or remove the card and insert it into the card reader. If you're working with your phone's internal storage via USB, formatting options may be limited, so the card reader method is preferable for external cards.
Open File Explorer (on Windows) or Disk Utility (on macOS). Find your drive in the list of devices. Right-click and select Format. In the settings window, select the file system.
| File system | Max. file size | Compatibility | Recommendation |
|---|---|---|---|
| FAT32 | 4 GB | All devices | For cards up to 32 GB |
| exFAT | No restrictions | Android 4.4+ | For cards from 64 GB |
| NTFS | No restrictions | Read only on Android | Not recommended |
| ext4 | No restrictions | Linux/Root only | For advanced users |
For most modern smartphones, the optimal choice is exFAT. It supports files larger than 4 GB, which is critical for recording video in high definition, and at the same time is perfectly readable by the Android system without the need for root access.
Uncheck the “Quick format” item if you want to conduct a full scan of sectors for physical damage. This will take more time, but will allow you to identify bad sectors that may cause the phone to freeze in the future.
Using the SD Card Formatter utility
If standard Windows formatting gives an error or the process fails, you should use specialized software. The SD Association has released an official utility SD Card Formatterthat takes into account the specifics of flash memory.
The app automatically determines the optimal cluster size for your memory card, which ensures maximum performance and durability of the drive. It also ignores some system partitions that can be accidentally erased using ordinary means.
1. Run SD Card Formatter as administrator.2. Select the drive letter corresponding to your card.
3. In the Format type field, select "Overwrite format" for deep cleaning.
4. Click the Format button and confirm the action.
⚠️ Attention: Make sure that you have selected the letter of the memory card, and not the computer’s system drive. An error in your selection will result in loss of data on your PC’s hard drive.
After completing the utility, remove the card and insert it back into the phone. Android will offer to format the disk again to suit your needs - agree with this proposal in order to create the correct folder structure for the system.
Specialized software restores the factory settings of the card controller, which often solves problems with writing speed that are not resolved by conventional formatting.
Advanced methods: ADB and command line
For users with superuser rights (Root) or USB debugging enabled, a format method via the console is available. This allows you to work with partitions that are hidden from the average user and change the file system to more exotic options.
Connect the phone to the computer and open the command line in the tools folder ADB. Enter the command to enter the device shell. You will need to determine the block name of your memory card, usually this /dev/block/mmcblk1 or another designation.
Use the utility mkfs to create a new file system. For example, to create exFAT, enter the appropriate command. Be extremely careful: one mistake in the name of the section can erase data on the internal memory of the phone.
- 💻 Enter
adb shellto connect to the phone terminal. - 🔍 Use the command
ls /dev/block/to search for the card name. - 🛠 Perform formatting with the command
mke2fs -t ext4 /dev/block/mmcblk1p1(example for ext4).
This method is often used when installing custom recovery or transferring the system to a memory card. It is not recommended for ordinary users, as it requires deep knowledge of the partition structure Linuxon which Android runs.
Solving problems and common errors
Often users are faced with a situation where the phone writes “SD card is damaged” or refuses to format the disk. Most often, the reason lies in a physical malfunction of the card or a controller failure.
Try to clean the card contacts with a soft eraser and wipe them with alcohol. Contact oxidation is a common cause of reading errors. If this doesn't help, try the card on another device. If the error persists everywhere, the card is most likely faulty.
Sometimes the problem lies in the phone slot itself. Ingress of dust or moisture may impair contact. In such cases, formatting is impossible in software; the connector must be cleaned or the device repaired at a service center.
What to do if the card is write-protected?
Check the physical Lock switch on the SD adapter. If it is not there, the card may have exhausted its rewriting resource and switched to read-only mode to save data - such a card needs to be replaced.
It is also worth checking whether USB debugging mode is enabled in the “Charge Only” mode. Switch the connection mode to “File Transfer” before trying to format via a computer.
Is it possible to recover data after formatting?
There are chances, but they are small. If regular formatting was used, you can try to return the data using apps like DiskDrill or Recuva. If “Full formatting” is selected or the card was encrypted as internal memory, recovery is almost impossible.
How often should you format a memory card?
There is no special frequency. Formatting is only required when errors occur, performance slows down, or when changing devices. Frequent re-partitioning without necessity only reduces the resource of memory cells.
Why did the card's volume become smaller after formatting?
Some of the space is occupied by service information and the file system. In addition, manufacturers indicate the volume in decimal (1 GB = 1000 MB), and systems count in binary (1 GB = 1024 MB), which creates a visible difference.
Is it possible to undo formatting of the internal memory?
Yes, but only by reformatting it to Portable Storage mode. This will delete all data on the card. It is impossible to return files without losing information.