Owners of the popular Xiaomi Redmi 4X budget smartphone often face a shortage of internal space after months of active use.built-in 16 or 32 GB quickly fill up with messengers, photos and app cache, which makes you think about expanding storage. Fortunately, this model supports the installation of external drives, which allows you to significantly increase the available volume for personal data.
However, not all cards work equally stable, and choosing the wrong media can lead to a decrease in system speed or loss of files. In this article, we will discuss in detail which memory card is suitable for your device, what technical limitations exist and how to format the drive correctly.
A properly selected microSD will turn your gadget into a powerful multimedia center, you can record high-resolution videos, store thousands of tracks and not worry about the lack of space for new system updates.
Technical specifications and format support
The Redmi 4X, based on the Snapdragon 435 processor, has certain memory controller technical limitations that must be considered when buying accessories. Official documentation indicates support for microSDHC and microSDXC cards, which opens up wide opportunities for upgrades.
The maximum volume of supported card is 128 GB. Although there are reports on forums of successful work with 256 GB drives, it is impossible to guarantee the stability of writing and reading on such volumes.
Why does a 256GB card not work?
It's important to pay attention to the physical type of connection. This model uses a combined slot, which will be discussed in detail below, which means you have to choose between two SIM cards or one SIM card and a memory card.
- 📀 Supported formats: microSD, microSDHC, microSDXC.
- 💾 Maximum guaranteed volume: up to 128 GB inclusive.
- 🔌 Type of connector: hybrid slot (SIM 2 / microSD).
Speed classes and performance of drives
When choosing a memory card for Xiaomi, not only volume, but also write and read speed is critical. Budget models without class labeling can have a write speed of less than 5 Mb / s, which will lead to long downloads of games and “freezes” when watching videos.
For a comfortable system and application installation on an external medium (Adoptable Storage feature), it is recommended to use cards Class 10 and above. If you plan to record video in Full HD or 4K resolution (although the phone’s camera may have limitations), you will need the UHS-I U3 standard.
Read Speed affects gallery load times and heavy file openings. Low speed will become a bottleneck while you keep shooting or recording video. Don't skimp on this, the price difference between classes is minimal, and the feeling is huge.
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Use cards labeled A1 or A2 (Application Performance Class) that are optimized for application use and provide more random access to data than regular cards.
Note the V30 or V60 markings on the card case, which guarantee a minimum constant video recording speed, which is important for the stability of the multimedia functions of the smartphone.
Comparison of popular brands and map models
The market is full of offers, but Redmi 4X is better to choose proven brands that rarely sin marriage. Market leaders remain Samsung, SanDisk and Kingston. Buying cards of unknown Chinese brands from marketplaces often leads to the purchase of counterfeits with a real volume of 5 times less than the declared.
Below is a comparative table of popular models that have proven themselves in conjunction with Snapdragon processors in the mid- and budget segment.
| Model map | Class speed | Max. Reading. | Recommendation |
|---|---|---|---|
| SanDisk Ultra | Class 10 / U1 | up to 100 Mb/s | The best choice |
| Samsung EVO Plus | Class 10 / U3 | up to 100 Mb/s | For gaming and 4K |
| Kingston Canvas Select | Class 10 | up to 80 Mb/s | Budgetary option |
| Transcend High Endurance | Class 10 / U3 | up to 95 Mb/s | For the DVR. |
High Endurance or Max Endurance are designed to be cyclical, so if you use your phone as a DVR or a surveillance camera, your regular map will fail in six months, and your dedicated map will last for years.
Instructions for installation and physical installation
Installing a card in the Redmi 4X requires care because of the tray design.You'll need a special paper clip (included) or a thin needle. Don't use excessive force to avoid damaging the extraction mechanism.
The process starts with the device shutting down, which is a must, because a hot connection can cause damage to the file system or even an electrical surge that is harmful to the controller.
⚠️ Warning: Never try to insert a memory card into a slot SIM-The size and location of the contacts vary, and the physical effort will cause the contact areas inside the smartphone to break down.
☑️ Algorithm of map installation
Note the shape of the tray. In Redmi 4X, it has a specific shape, where the memory card is placed on top of the second SIM card or in a separate compartment, depending on the revision of the board. Make sure that the card sits tightly in the notch and does not protrude beyond the edges, otherwise it may not contract when closed.
Once turned on, the phone should emit a characteristic sound or display a notification about a new drive. If this does not happen, check the correct installation of contacts (gold pads should look down at the contacts of the phone).
Setup and formatting in the Android system
Once you have the physical installation, the system will offer you to configure the drive, and you will have two options: use it as a portable storage device or as internal memory, the first option is to store photos, videos and music that are also available from other devices.
The second option, internal memory, encrypts the card and links it to a particular phone, and then you can't extract the card and read it on your computer without re-authorizing it, and this method allows you to install applications on the map, expanding the useful volume.
Settings → Storage and Memory → SD- Card → Set up → Internal MemoryIn the process of formatting, all the data on the map will be destroyed. If there was important information on the media, pre-copy it to the computer, the system will create a new file structure optimized for Android.
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Formatting a card as internal memory greatly speeds up the application experience, but makes the card useless without that particular smartphone.
If you choose portable storage, you can pull out the card and paste it into another device at any time, but you can't all port applications in this mode, because many developers don't allow you to install their programs on external media.
Solving and diagnosing errors
Sometimes users are faced with a situation where the phone sees the card but can not read the data, or constantly requires re-formatting, most often this indicates file errors or file system incompatibility.
Try connecting the card to your computer through a card reader and checking it for errors with standard Windows or macOS tools. It is also useful to use the SD Memory Card Formatter utility from the SD Association, which restores the factory parameters of the card.
⚠️ Warning: If the memory card heats up in the chip area while the smartphone is running, it is a sign of a controller malfunction or short circuit.
A common problem is the slow operation of the interface after installing the card. This is treated by clearing the media scanner cache. Go to Settings → Apps → Show system processes → Media service and click Clear cache, then restart the device.
If the card is defined as empty, although the files are on it, it may be formatted into an NTFS or exFAT file system with an incompatible cluster size. For Android, the optimal file system is FAT32 (for volumes up to 32 GB) or exFAT (for volumes above 32 GB).