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PC FIX
Peripherals

SD card not recognized by computer

If “SD card not recognized” repeats, it is better to narrow the scope to the card reader driver/contact, card file system, or malfunction rather than changing several settings at once. Cross-test cards, readers, and ports, and if you need existing data, prioritize backup and recovery over formatting.

Solving Order
We've organized the methods starting with the simplest and least expensive ones. Please check the solutions one by one, starting from the top.

Do you have these symptoms?

  • SD card not recognized
  • Memory card not detected
  • No card reader

main causes

  • Card reader driver/contact
  • Card file system or failure

How to solve

Please check them in order from the top. If the issue is resolved, you do not need to proceed to the next step.

1

Checking the SD card lock switch and contact status

Physical locking or poor contact can cause recognition and writing problems.

Difficulty Easy time 3 minutes cost 0 won
  1. 1Check the position of the LOCK switch on the SD adapter.
  2. 2Take out the card and insert it again all the way.
  3. 3Check that there is no heavy contamination or damage to the contacts.

confirmation point

After these steps, see if the “SD card not recognized” symptom decreases or disappears. If there is no change, the possibility of contact with the card reader driver is also checked in the next step.

2

Test on another card reader or PC

Determine whether the problem is with the card or the reader.

Difficulty Easy time 5-10 minutes cost 0 won
  1. 1If you have a USB card reader, cross test it.
  2. 2Check if the card can be read by another PC or camera.
3

Check if the card is visible in Disk Management

You can check if it is a drive letter or partition problem.

Difficulty Moderate time 5-10 minutes cost 0 won
  1. 1Open Disk Management.
  2. 2Check if the card capacity and partition are visible.
  3. 3If the card contains data, do not format or initialize it immediately.
4

Update or reinstall card reader driver

Outdated or damaged card reader drivers can cause the symptom.

Difficulty Moderate time 10~30 minutes cost 0 won
  1. 1Check the device in Device Manager.
  2. 2Check the card reader driver for your current model on the PC or component manufacturer site.
  3. 3If the problem started immediately after an update, consider rolling back to the previous stable version.
  4. 4After installing the driver, restart your PC.
5

Stop writing operations if there is important data

Repeated formatting and recovery when a card error is severe can increase data loss.

Difficulty Moderate time immediately cost 0 won
  1. 1If there are important photos or files, we will only attempt to read them if possible.
  2. 2If awareness is unstable, consider professional recovery.

Frequently Asked Questions

We've put together a list of things we frequently check regarding this issue.

Related issues

If the symptoms do not match exactly, please check the issue below.

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SD card is write-protected and files cannot be saved

When troubleshooting an SD card that is write-protected and cannot save files, it is important to rule out the causes one at a time. Based on the “SD card write prohibited” symptom, check the lock switch, file system, and controller protection status and proceed to the next step. Cross-test cards, readers, and ports, and if you need existing data, prioritize backup and recovery over formatting.

View solutions →
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USB device not recognized issue

When troubleshooting USB devices not being recognized, it's important to rule out the causes one at a time. Based on the “USB not recognized” symptom, check the port/cable problem and USB driver, then proceed to the next step. Cross-test devices, cables, and USB ports and check for power management and driver issues.

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If “Webcam USB not recognized” repeats, it is better to narrow down the scope to the USB connection/port and camera driver rather than changing several settings at once. Check camera permissions, apps in use, and device recognition status, then check the driver and physical connection.

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Gamepad not recognized in Windows

If “Gamepad PC not recognized” repeats, it is better to narrow the scope to USB/Bluetooth connection and controller driver rather than changing several settings at once. Check the wired/wireless connection, in-game input method, and driver to find the cause of the conflict.

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