How to insert a memory card in Xiaomi Redmi Note 4: a guide with photos and nuances

Why Redmi Note 4 owners choose memory cards and what to know before installing them

Xiaomi Redmi Note 4 is one of the most popular mid-range smartphones, released in 2017. Despite its age, the device is still actively used thanks to reliable hardware and support for custom firmware. However, the 16/32/64 GB of internal memory that was offered in various versions of the model today seem to many users insufficient.

But there are a few pitfalls here. First, the Redmi Note 4 supports a hybrid slot: either two or more. SIM-card SIM + Second, not all memory cards are compatible with the device — some may not be recognized or work with errors. Third, improper installation can damage the slot contacts or the card itself. This article will help you avoid typical mistakes and maximize the memory of your smartphone.

Before we get to the instructions, the key question is, should you install a microSD in 2026 at all? If you use the Redmi Note 4 as a second phone, for music, photos or offline maps, yes. If it's your main gadget with dozens of apps, you'd better consider cloud storage or switch to a model with more internal memory.

Which memory card to choose for Xiaomi Redmi Note 4: technical requirements

Not all microSDs are equally useful. The Redmi Note 4 officially supports up to 256GB of memory cards, but in practice some models may have problems.

• 🔹 Type of card: microSD only (not miniSD or miniSD) SD!). MicroSDHC (up to 32 GB) and microSDXC (64 GB) standards are supported).
• 🔹 Speed class: minimum Class 10 (UHS-I). To record video in 4K Frequent file transfer is better to choose UHS-I U3.
• 🔹 Brand: Give preference to proven manufacturers – SanDisk, Samsung EVO, Kingston, Transcend – Cheap no-name cards are often forged to indicate inflated volume.
• 🔹 Formatting: The smartphone supports FAT32 (up to 32 GB and exFAT (64 GB). NTFS not recommended.

Important: The Redmi Note 4 does not support Adoptable Storage technology, so the card will appear as a removable drive, which means that most applications cannot be migrated to it – only media files, documents and some games (through manual data copying).

⚠️ Attention, if you buy a memory card with a larger size 128 GB, be sure to check it for authenticity with the utility H2testw (Windows or F3 (Linux/macOS). Fake cards often have a real volume of 2–4 less than the declared, and the remaining space is “clogged” with garbage data.

Preparing your phone: what to do before installing a memory card

Before you get the tray out for SIM-Take a few simple steps to avoid problems:

1. Turn off the phone. It is a must-have - hot memory card replacement can damage the file system or slot contacts.
2. Check the current contents. If your phone already has a memory card, copy all the data from it to your computer, and when you first connect a new card, your smartphone may suggest formatting it.
3. Clean the slot from dust. Use a dry brush or a compressed air balloon. Dust and debris can interfere with proper contact.
4. You'll need a paper clip or a special key to retrieve the tray (complete with your phone).

If you plan to use a memory card to store applications (despite the limitations of Redmi Note 4), pre-installe a file manager with manual data transfer, such as Solid Explorer or FX File Manager. Also check which of your applications support data storage to an external drive - this information can be found in the settings of each application.

Is the phone off?

Is the data from the old card (if any) copied?

Is there a paper clip or a key for the tray at hand?

Is the slot dust-free?

Is the file manager ready to work with the card?-->

Step-by-step: how to insert a memory card in Xiaomi Redmi Note 4

Now, to the process itself, follow the instructions carefully, because errors in this phase can cause mechanical damage.

Step 1. Remove the tray for SIM-map

The tray is located on the left side of the phone (if you look at the screen). Put a paper clip or key in a small hole next to the tray and press before you click. The tray will extend about 5 mm - carefully pull it out completely.

Step 2. Place the memory card in the Redmi Note 4 tray has a hybrid slot: you can use either two nano-SIMs or one nano-SIM + microSD.

• 📱 Slot 1 - always for SIM-cards (supports) 4G).
• 📱 Slot 2 or second SIM, MicroSD, but not at the same time!).

The memory card is set with gold contacts down until you click. Don't force it -- if it doesn't come in, check its orientation.

Step 3. Set the tray back.

Carefully insert the tray into the slot to the point. Make sure it sits flat -- if the tray is skewed, remove it and try again. Don't turn on the phone until you make sure the tray is fixed.

Step 4: Turn on your phone and set up the map

Once enabled, Redmi Note 4 may suggest formatting the card (if it is new or used on another device); only accept if there is no important data on the card, formatting will delete all of its contents; if the card is already formatted in FAT32 or exFAT, the smartphone will recognize it automatically.

Common Mistakes When Installing a Memory Card and How to Avoid Them

Even experienced users sometimes experience problems with microSD, and here are the most common mistakes and ways to solve them:

• 🚫 The card is not inserted into the tray Reason: wrong orientation or incompatible form factor (for example, trying to insert a miniSD). Solution: flip the card with contacts down and make sure that it is a microSD.
• 🚫 Phone asks to format the card with each connection Reason: Incompatible file system (e.g., file system, NTFS) Solution: format the map on your computer in FAT32 (for cards up to 32 GB or exFAT (for cards from 64 GB).
• 🚫 The map is recognized, but the files are not copied Reason: write protection (the map has a Lock switch) or not enough space. Solution: check the switch on the map and make room.
• 🚫 Phone overheats or discharges quickly after installing card Reason: fake or damaged memory card Solution: Test card with utility H2testw and replace if necessary.

⚠️ If after installing the memory card, the Redmi Note 4 began to spontaneously restart or give an error "SD-This may indicate a malfunction of the card controller or a problem slot in the phone, further use in this state can lead to data loss or damage to the phone.

Another common problem is the slow operation of the card. If you notice that files are copied too long or video is recorded with jerks, check the speed class of your microSD. Full HD video requires a minimum of Class 10, for 4K - UHS-I U3. If the card does not meet the requirements, replace it with a faster model.

How to transfer data to a memory card: applications, photos, music

While the Redmi Note 4 doesn’t support Adoptable Storage, you can still manually transfer some of the data to an external drive, and here’s how to do it for different file types.

1. Photo and video transfer

The easiest way is to use the standard Gallery app:

1. Open the Gallery and select an album or individual files.
2. Press More. → Move it.
3. In the folder list, select SD-map and specify the target folder (or create a new one).

Alternative: Connect your phone to your computer in File Transfer (MTP) mode and copy files through Explorer.

2. Transfer of music and documents

Use any file manager (e.g. Mi File Manager):

1. Open the manager and go to the file folder (such as Music or Downloads).
2. Select the files you need, click Cut or Copy.
3. Go to the root catalogue SD-map (/storage/XXXX-XXXX) And put the files in.

3. Transfer of applications (partially)

Unfortunately, most applications cannot be moved to SD-card in Redmi Note 4. However, some games (for example, with a cache on an external drive) allow you to save data to the card:

1. Open the Settings → Applications.
2. Select the desired application and click Storage.
3. If the option to Change is available, select SD-map (not available for all applications).

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To speed up access to files on SD-Create folders with clear names (e.g. Music, Photos, Documents) on the map, which will simplify navigation and reduce the risk of data loss in random formatting.

What to do if the memory card stopped working: diagnosis and repair

If your microSD suddenly stops recognizing or starts to give out errors, don't rush to throw it away. In 80% of cases, the problem can be solved by yourself.

1. The card is not detected on any device

It's probably a damaged controller or contacts.

• Clear the contacts of the card with a soft eraser (without pressing!).
• Connect the card through the card reader to the computer and check in the utility Disk Management (Windows) or GParted (Linux).
• If the map is defined as unmarked space, try recovering data with Recuva or PhotoRec.

2.The map is determined, but the files are not read

The probable cause is file system damage.

• Connect the card to your PC and execute the command in cmd (on behalf of the administrator): chkdsk E: /f (replace E: with the letter of your drive).
• If chkdsk doesn’t help, format the card in FAT32 (be aware that all data will be deleted!).

3.The map is working, but very slowly

This is a sign of memory wear (typical for cheap cards after 1-2 years of use).

• Check the card speed with CrystalDiskMark – if the write speed is below 10 MB/s, it’s time to replace the card.
• If the card is relatively new, try formatting it with full erasure (the Full Format option in SD Formatter).

⚠️ If the card is physically damaged (cracks, chipped, melted contacts) after the diagnosis, do not try to restore it, this can short-circuit and damage the slot in the phone.

FAQ: answers to frequent questions about memory cards in Xiaomi Redmi Note 4

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If you use the Redmi Note 4 as your primary smartphone, consider switching to a model with more internal storage (such as the Redmi Note 10 or POCO X3).