Fix MicroSD Card Not Detected on Steam Deck

Tags: steam deck

Written by: Tushar Sharma

I recently got a new 512GB MicroSD card for my Steam Deck. After inserting it, SteamOS didn't recognize it. Here's how I fixed it via SSH.

Step 1: Connect via SSH

Replace it with your Steam Deck's IP address. For informaiton on how to find it here

Step 2: Identify the SD Card

Look for the mmcblk0 device:

mmcblk0      477.5G disk
└─mmcblk0p1  477.5G part

• mmcblk0 - the SD card device
• mmcblk0p1 - the partition

Step 3: Create Partition Table

Wipe and create a fresh GPT partition table:

Step 4: Format as ext4

SteamOS requires ext4 for game storage:

Verify the filesystem:

You should see ext4 with label steamdeck.

Step 5: Mount Using udisks

SteamOS uses udisks for mounting, not /etc/fstab:

The card mounts to /run/media/deck/steamdeck.

Step 6: Add to Steam Library

1. Switch to Desktop Mode
2. Open Steam
3. Go to Steam → Settings → Storage
4. Click Add Drive (or the + button)
5. Browse to /run/media/deck/steamdeck
6. Click Add

Verify in Game Mode

Return to Game Mode and check Settings → Storage. You should now see both:

• Internal SSD
• SD Card (~477 GB)

Your SD card is ready for installing games.

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