Which memory card is suitable for Xiaomi Redmi 9A: a full analysis of compatibility and recommendations

Xiaomi Redmi 9A is one of the most popular budget smartphones, but its internal memory (32 or 64 GB) quickly runs out, especially if you actively shoot videos, install games or store music. The solution is to install a microSD card, but not every one will work. In this article, we will discuss which cards are compatible with the Redmi 9A, what to look for when buying, and how to avoid typical errors that lead to brakes or data loss.

The smartphone supports microSDXC cards up to 512GB (up to 256GB is officially announced, but tests show that it can work in large volumes), but the key is not only the size, but also the speed class and format of the file system. The wrong choice can lead to the card being identified as corrupted or running 10 times slower than it could.

Technical requirements: what Xiaomi says about compatibility

The official documentation for the Redmi 9A indicates that the smartphone supports microSD cards (including microSDHC and microSDXC) with a maximum capacity of up to 256 GB. However, this limitation is more related to the manufacturer’s testing than hardware capabilities. In practice, users successfully use 512 GB cards (for example, SanDisk Ultra 512GB), but with reservations:

• 🔹 The map should be formatted in FAT32 exFAT. NTFS unsupported.
• 🔹 Minimum Speed Class – Class 10 (or UHS-I U1). Cards below (Class) 4/6) will slow down.
• 🔹 The Best Choice for Video Recording 1080p — UHS-I U3 or V30.
• 🔹 Adoptable Storage support is possible, but not recommended due to the risk of data loss.

⚠️ Note: If you plan to record video in Full resolution HD (1080p), Class 10 cards may not be enough. For stable work, choose models with labels. U3 or V30 — They guarantee a recording speed of at least 30 MB / s.

It is important to note that Redmi 9A equipped with a slot for a memory card of a hybrid type (combined with a SIM-This means that you can use either 2 SIM + without a memory card, or 1 SIM + microSD: If you're critical to have two SIMs, you'll have to choose between them and additional storage.

Classes of speed and marking: how not to get confused in the designations

There are different markings on memory cards: Class 2/4/6/10, UHS-I/UHS-II, U1/U3, V6/V10/V30/V60/V90. Let’s see what they mean and what they mean for Redmi. 9A:

For most tasks, a Redmi 9A will suffice with a U1 or Class 10 card, but if you are shooting videos in Full HD or installing games like Genshin Impact or Call of Duty Mobile, you should take U3/V30. Cards labeled UHS-II will not give you any speed gain, since the smartphone slot does not support this standard.

⚠️ Warning: Some merchants only indicate read speeds on the cards (e.g., "up to 100MB/s") but remain silent about write speeds. 9A The critical speed of recording is at least 10 MB / s (for Class 10) or 30 MB / s (for Class 10) U3). Check this parameter in the characteristics!

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If you are buying a video recording card, check out the V30 or V60 markings, which ensure a stable recording speed even during long sessions.

Top.-5 Memory cards for Xiaomi Redmi 9A: reliability and price

There are hundreds of memory cards on the market, but not all of them are equally good, and we tested the popular ones and ranked them for compatibility, speed and durability.

1. SanDisk Ultra microSDXC UHS-I U1 A1 (128-512 GB) Best price/quality balance: read speed up to 120 MB/s, write up to 40 MB/s. Suitable for games and video 1080p. Average price: 1,200 ₽ 128GB.
2. Samsung EVO Plus microSDXC UHS-I U3 (64-512 GB) Reliable card with a recording speed of up to 90 MB/s. Ideal for frequent video recording. Price: 1,500 ₽ 128GB.
3. Kingston Canvas Go! Plus microSDXC UHS-I U3 (128-512 GB Budget equivalent Samsung EVO. Record speed up to 80 MB/s Price: 1,100 ₽ 128GB.
4. Lexar Professional 1066x microSDXC UHS-I U3 (64-512 GB Professional Series with high speed (up to 160 MB/s reading) Overpay for brand, but reliability is high. Price: 2000 ₽ 128GB.
5. Silicon Power Superior microSDXC UHS-I U1 (128-512 GB) The most budget option in the top. Record speed is up to 20 MB / s. Suitable for photos and music. Price: 900 ₽ 128GB.

When choosing, consider the warranty (official brands have a 5-10 year warranty) and the country of manufacture. SanDisk and Samsung cards made in Japan or Korea last longer than their Chinese counterparts. Avoid no-name brands, they often forge speed class labels.

Buy only from official dealers (for example, in branded stores SanDisk or Samsung)

Require a check indicating the model and serial number

Check the map with H2testw for authenticity.

Compare the speed with the stated (can be used through the A1 SD Bench app)

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How to insert a memory card in Redmi 9A: Step-by-step instructions

Installation of a memory card in Redmi 9A It requires care, as the slot is combined with SIM-Follow the instructions to avoid damaging your contacts:

1. Turn off your smartphone (required!) Removing the card on the device on may cause the file system to crash.
2. Find a tray for SIM-You can use a paper clip or a special key to extract the card.
3. Place the tray on a flat surface. Insert the microSD into the appropriate slot (usually signed as SD or TF). The card's contacts should be directed downward.
4. If you use one SIM-card, insert it into the slot SIM 1 (slot) SIM 2 will be blocked).
5. Carefully insert the tray back before the click. Don't make any effort!
6. Turn on your smartphone. Wait for the memory card to be detected.

⚠️ Note: If the card is not determined after installation, check: 🔹 Correct installation (contacts must be clean, without scratches). 🔹 File system format (if the card is new, format it in the file system) FAT32 PC). 🔹 Compatibility (some cards) UHS-II may not be recognized).

After the first connection, the smartphone will suggest choosing the way to use the card:

• 📁 Portable storage – the card works like a flash drive (recommended).
• 🔄 Adoptable Storage – the card becomes part of the system (the risk of data loss during retrieval!).

Choose the first option if you do not want problems with data transfer.

Memory card formatting: FAT32 vs exFAT

When you first use a memory card, you need to format it. Redmi 9A supports two main formats:

• 🔹 FAT32 — Compatible with all devices, but has a file size limit (4GB) Suitable for cards up to 32GB.
• 🔹 exFAT is a modern format with no file size restrictions, optimal for 64 GB cards and more.

How to format the map correctly:

1. Connect the card to the PC through the card reader.
2. Open this computer (Windows), find a removable disk.
3. Right-click. → Format.
4. Select the file system: For cards ≤ 32 GB - FAT32. For cards > 32 GB - exFAT.

Start.

⚠️ Note: Do not format the map into NTFS — Redmi 9A Also avoid "quick formatting" on maps that have been previously used on other devices (e.g. cameras) - this can lead to read errors.

If you plan to use the card as an internal memory (Adoptable Storage), the smartphone will automatically format it into an encrypted format EXT4.

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For maximum compatibility, choose exFAT for cards ranging from 64 GB and FAT32 for cards up to 32 GB. Avoid NTFS and "fast formatting" on used cards.

Common Mistakes When Using Memory Cards and How to Avoid Them

Even the right card can be unstable due to user errors, and consider the most common problems and solutions:

• 🔸 Suddenly removed: Reason: The card was retrieved without first "safely shutting down." Always use the option to Remove in the storage settings before physical extraction.
• 🔸 Slow card operation: Reason: Using a Class card 4/6 Check the speed through the app. A1 SD Bench.
• 🔸 Card is defined as corrupted: Cause: Incorrect file system formatting or failure. Format the card in exFAT via PC.
• 🔸 Applications are not installed on the card: Reason: the card is formatted as portable storage. To transfer applications, you need to use Adoptable Storage (but it is risky!).
• 🔸 Map gets hot: Reason: Intense data recording (e.g., video shooting) 1080p Class card 10). Replace the map with U3/V30.

If the card stopped being determined after the smartphone fell or moisture hit, the problem may be in the slot contacts.

1. Turn off the phone and remove the card.
2. Dry the slot with a hair dryer (cold air!) or leave your phone in the rice for 12 hours.
3. Clean the contacts of the card and slot with alcohol (at least 90%).
4. If it does not help, contact the service center (possibly damaged the slot controller).

FAQ: Answers to Frequent Memory Card Questions for Redmi 9A