Connecting a memory card to Xiaomi Redmi 8: a guide with nuances and life hacks

Xiaomi Redmi 8 is one of the brand’s most popular budget smartphones, still in use today for its reliability and memory expansion. However, connecting a microSD card to this device has a number of features that many users will only learn about after buying. Unlike flagship models, where a memory card slot is often combined with a SIM tray, it implements a hybrid scheme – and this creates additional questions.

In this article, we will not only discuss the basic procedure for installing a memory card, but also the hidden MIUI settings that allow you to use microSD as the main storage for applications. You will learn how to format the card correctly to avoid reading errors, which memory card models are best for the Redmi 8, and what to do if the phone does not see the installed microSD. Particular attention will be paid to optimization of performance, because improper use of the memory card can slow down the smartphone.

Which memory card to choose for Xiaomi Redmi 8

Xiaomi Redmi 8 supports microSD memory cards (including microSDHC and microSDXC) up to 512 GB. However, not all cards work equally well with this device.

• 🔹 Speed class: Minimum recommended Class 10 (or UHS-I U1). To record video in 4K It is better to transfer files quickly. UHS-I U3 or A2 (optimized for applications).
• 🔹 Brand: Give preference to proven manufacturers – SanDisk, Samsung EVO, Kingston, Transcend – Cheap no-name cards are often forged to indicate inflated volume.
• 🔹 Volume: for basic use (photos, music) will be enough 64-128 GB. If you plan to transfer applications to the map – take 256 GB and above.

Redmi 8 has a hybrid slot (2) SIM + microSD or 1 SIM + microSD. This means that if you use two SIM-I'm not going to get a card, I'm going to have to choose between two. SIM, expansion of memory.

⚠️ Note: Some users face a problem when the phone does not see cards larger than 256 GB. MIUI. The solution is to upgrade to the latest version or format the card in exFAT (see section below).

Step-by-step: how to insert a memory card

Installing a microSD in Xiaomi Redmi 8 requires care — improperly removing the tray can damage contacts.

1. Turn off your phone.This is a must to avoid damage to the card or system failure when hot-swapping.
2. Find a tray for SIM-cards on the left side of the smartphone (near the volume buttons).
3. Use a paper clip or a special key (comes included) to press the hole and remove the tray.
4. Place the memory card in the top slot (the bottom one is for SIM). The microSD should lie down with gold contacts.
5. Carefully insert the tray back before the click. Don't put too much effort into it!
6. Turn on the phone and wait for the identification of the card (notification will appear in the curtain).

If the phone does not recognize the card after turning on, check:

• 🔸 Correct installation (contacts should fit tightly).
• 🔸 No damage on the map (scrapes, chips).
• 🔸 File system compatibility (see next section).

Memory card formatting: FAT32 vs exFAT

Xiaomi Redmi 8 supports two file systems for microSD: FAT32 and exFAT.

• 📁 FAT32: ✅ Compatible with all devices (including old cameras, DVRs). ❌ File size limit: maximum 4GB (video issues) 4K or large archives).
• 📁 exFAT: ✅ Support for files >4GB, optimized for flash memory. ❌ It may not be readable on some devices (e.g. car radios).

If you plan to use the card only on your phone, choose exFAT. For universal use (for example, transferring files between your phone and your computer), FAT32 will do, but you will have to put up with a limitation on file size.

How to format the card directly on the phone:

1. Go to Settings → Memory → Memory Map.
2. Click Format → Internal Memory (if you want to use it as an extension) or Portable Storage (for normal use).
3. Select the file system (if available) and confirm the action.

⚠️ Attention: Formatting removes all data from the card! If it has important files, copy them to the computer beforehand. Also, do not interrupt the formatting process - this can damage the card.

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If the phone doesn’t offer a choice of file system when formatting, connect the card to your computer and format it through standard Windows tools (right-click on the disk → “Format”).

Configure a memory card as the main storage

One of the key features of the Xiaomi Redmi 8 is the ability to use microSD as internal memory (Adoptable Storage), which allows you to transfer applications to the map, saving space in the built-in drive.

• 🔧 Once set up, the card will be encrypted and will not be read on other devices.
• 🔧 The speed of applications from the card is lower than from the built-in memory (even when using it). UHS-I U3).
• 🔧 Not all apps support mapping (especially system and high-demand games).

How to set up a card as an internal memory:

1. Put the card in and wait for her identification.
2. Go to Settings → Memory → Memory Map.
3. Press Three Dots (menu) → Storage settings → Internal Memory.
4. Confirm the formatting (the data will be deleted!).
5. After the process is complete, click Transfer Data to move supported applications.

Important: After this procedure, the card can't be retrieved without losing data, and if you decide to return it to portable storage, you'll have to format it again.

Transfer applications to memory card

Even if you set up a card as internal memory, not all applications can be migrated to it. MIUI limits this feature for system programs and some games. Here's how to check and migrate supported applications:

1. Open Settings → Applications → Application Management.
2. Select the application you want to transfer.
3. Click Warehouse → Change → Memory Map.
4. Wait until the process is completed (may take a few minutes).

List of applications that cannot be transferred to the map:

• 📱 System applications (Settings, Phone, Messages).
• 🎮 High-demand games (PUBG Mobile, Genshin Impact).
• 🔒 Applications with protection (banking, messengers with encryption).

If the port button is inactive, the app does not support this feature, and the alternative is to use Lite versions of apps (such as Facebook Lite) that take up less space.

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Transferring applications to a memory card reduces their performance by 15-30% compared to working in internal memory.

Frequent mistakes and their solutions

Redmi 8 users often experience problems with memory cards, and let’s look at the most common errors and ways to fix them:

If the card is no longer defined after the MIUI update, try:

1. Reboot the phone.
2. Remove and re-insert the card.
3. Check for firmware updates (some versions of MIUI had microSD-enabled bugs).

⚠️ Note: If a memory card starts to get bugged (for example, files suddenly disappear or get damaged), this may be a sign of wear and tear on the flash memory.

Optimizing the use of a memory card

To make the memory card in Redmi 8 work as efficiently as possible, follow these tips:

• 📲 Regularly clean the cache of applications that store data on the card (for example, instant messengers, social networks).
• 📷 Configure the default photo/video saving to the map: open the Camera → Settings → Preservation site → Memory map.
• 🎵 Transfer the library to the map: Use a file manager (such as Mi File Manager) to move the folders Music, Downloads, Pictures.
• 🔄 Avoid frequent reconnection of the card to different devices – this reduces its resource.

For advanced users, if you use the card as internal memory, you can turn off automatic updates to reduce the load on it.

1. Open Google Play.
2. Go to Settings → Auto-Update applications.
3. Choose Do Not Update Automatically or Wi-Fi Only.

It’s also helpful to disable map caching in Google Maps if you’re not using offline maps, which will free up a few gigabytes of space:

1. Open Google Maps.
2. Go to profile → Settings → Offline maps → Delete everything.

FAQ: Answers to popular questions