Xiaomi Redmi 3S — One of the most popular budget smartphones 2016 It's a year that's still used by many users, despite the modest characteristics of today's standards (2/16 GB in the basic version, the device supports memory expansion via microSD cards. However, the model has an important feature: a hybrid slot that requires accuracy when installing. 3S, What to consider when choosing a drive and what to do if the phone does not see the microSD.
Many owners face problems: the slot does not open, the card is not determined, the phone asks to format the drive, most often this is due to improper installation or incompatibility of the card. We will show you the process in photos, talk about the supported standards (up to microSDXC 256 GB), and give tips for optimizing work. If you just bought a Redmi 3S or want to upgrade the memory card, this is the guide for you.
Preparation: which memory card to choose for Xiaomi Redmi 3S
Before buying a microSD, make sure it is compatible with your smartphone. Xiaomi Redmi 3S supports microSD, microSDHC and microSDXC memory cards with up to 256 GB (up to 128 GB is officially announced, but tests show work with 256 GB from SanDisk and Samsung).
- 🔹 Speed class: Class recommended 10 or UHS-I (U1/U3) video-recording HD. Class Cards 4/6 They will be slowed down when recording rollers.
- 🔹 File system format: for cards up to 32 GB — FAT32, 64 GB – exFAT. The phone will automatically prompt you to format the card when you first connect.
- 🔹 Brands: it is better to choose proven manufacturers - SanDisk Ultra, Samsung EVO, Kingston Canvas – Cheap no-name cards are often forged (real capacity is less than claimed).
Important: Redmi 3S has a hybrid slot (slot 2) that works with either the second slot SIM-It's either a card or a microSD card, which means you can use two cards at the same time. SIM And you can't have a memory card, if you need both. SIM, You have to choose between them and the storage.
Where is the memory card slot in Redmi 3S?
At Xiaomi Redmi 3S squash SIM-The card and microSD are located on the right side of the case (if you look at the screen), easy to recognize by the small hole for the tool from the kit. On the outside, the slot is no different from most Xiaomi smartphones from that period, but there is an important difference inside:
- 📱 Combined tray: upper groove - for nano-SIM, lower - for microSD or second nano-SIM (to choose from).
- 🔧 Fixing: The fixer is metal, so do not try to open the tray with your nail - only with a special clip from the box.
- ⚠️ Labeling: There are little icons on the tray that show which side to insert cards. For microSD, these are the contacts down.
If you've never opened a slot, inspect it in good light.Sometimes dust or fine debris gets into the slots, which can interfere with proper installation.Wash the tray with a dry soft cloth before installation.
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If you don't have a paper clip, you can use a regular paper clip that is straight straight, and the main thing is not to use sharp objects (needles, pins) so as not to damage the fixation mechanism.
Step-by-step: how to insert microSD in Xiaomi Redmi 3S
Now, let's get to the process. Follow the instructions carefully so you don't damage the slot or the card.
- Turn off your phone. This is not necessary, but it is recommended to avoid failures in card recognition.
- Take a paperclip from the kit (or unbend stationery) and gently insert it into the hole on the tray before clicking.
- The tray will be pushed out a little - pull it on yourself and take it out completely.
- Put the tray on a flat surface with the contacts upwards, and you'll see two grooves: 📶 The top one is for nano-SIM (if you use it). 💾 Lower for microSD (or second nano-SIM).
bottom-groove
The card contacts looked down
Carefully press the card until a slight click - it should sit tightly, but without effort.
Put the tray back into the slot until it stops (again, without excessive pressure).
Turn on your phone and wait for the card to be recognized (usually 10–30 seconds).
Make sure the card is not damaged (no scratches on the contacts)
Check the capacity of the card on another device (laptop, camera)
Format the card in FAT32/exFAT if it is new
Turn off the phone before installation (optional, but recommended)-->
If the phone doesn't see the card after turning on, restart it or check if the tray is installed correctly. Sometimes a light swing of the card in the slot helps (but don't overdo it!).
What to do if Xiaomi Redmi 3S does not see the memory card
A common problem is that the phone doesn't recognize microSD, and there are many reasons, from mechanical to software, and here's what to check first.
| Problem. | Possible cause | Decision |
|---|---|---|
| The map is not defined at all. | Incorrect installation, oxidation of contacts | Reset the map, wipe the contacts with a lastic |
| Phone asks to format the card | Incompatible file system (NTFS, ext4) | Format in FAT32 or exFAT on PC |
| The map is determined, but the files are not read | A damaged file system | Connect to your PC and check for errors (chkdsk) |
| The phone freezes when you connect the card | Faulty card or slot | Try another card; if it doesn't help, contact the service |
If the card has previously worked but Suddenly has stopped being defined, try the following steps:
- Remove the card and insert it back.
- Reboot the phone.
- Check the card on another device (laptop, camera).
- Format the card in FAT32 via PC (save the data in advance!).
- Update the phone firmware to the latest version (in About Phone → System Update).
⚠️ Note: If the map doesn't work after formatting, don't try to recover data with programs like Recuva, which can make the damage worse.
How to transfer data to a memory card in Redmi 3S
Once you have successfully installed a microSD, you can transfer photos, videos, and even some apps to it. Here's how to do this:
- 📷 Photos and Videos: Open the Gallery, select files → Share. → Move it → Memory map.
- 🎵 Music and Documents: Use a Explorer (built-in or ES File Explorer to manually drag and drop files.
- 📱 Applications: Some programs can be moved through Settings → Annexes → Select an application → Memory. → Change. → Memory card. However, not all applications support this feature.
Important: not all data can be transferred, for example, system applications (Mi Account, Google Play Services) will remain in internal memory, and it is also not recommended to transfer messengers (WhatsApp, Telegram) to the map, this can cause errors when receiving messages.
How to make a memory card the default primary storage?
Frequent errors when installing a memory card and how to avoid them
Even experienced users sometimes make mistakes that lead to slot failure or data loss.
- 🚫 Upside down, the contacts should be directed down (to the back of the phone), if you mix the map up, the map will not stand in place or bend the contacts.
- 🚫 Use force to insert the tray. If the tray does not enter easily, the card is set incorrectly.
- 🚫 Ignoring the formatting request. If the phone suggests formatting the card, it's not always a mistake -- maybe the file system is incompatible. But first, copy the data to the PC!
- 🚫 Removing the card while writing data can damage both the card and the files. Always safely extract through the notification in the curtain.
⚠️ Note: if after the failed installation of the card, the phone stopped seeing SIM-The card in the same slot probably damaged the tray contacts.In this case, don't try to repair yourself - contact the service center. 3S usually does not exceed 1000-1500 rubles.
Another important point: don’t store critical data on your memory card without backing up. MicroSDs are more vulnerable to damage than your phone’s internal memory. Regularly copy important files to your PC or to the cloud (Google Drive, Mi Cloud).
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The main rule when working with memory cards in Redmi 3S: if something goes wrong (the tray does not insert, the card does not read), do not apply force.