playback keeps failing when i try to watch recordings saved on the sd card, says file corrupted or just spins. how do i fix the sd card?

Diagnosis

The failure to play back recordings on a Lorex 4K Spotlight Deterrence Camera is typically caused by "file system fragmentation" or "bad sector allocation" on the microSD card. Because 4K video streams generate massive amounts of data, the camera constantly writes and overwrites blocks of memory. If you are using a standard Class 10 card rather than a High-Endurance (U3/V30) card, the flash memory cells degrade rapidly. When the camera attempts to read a video file that spans across a corrupted memory sector, the playback engine hangs, resulting in the infinite spinning wheel or the "File Corrupted" error message. Furthermore, this issue often stems from an improper "handshake" between the card's FAT32 or exFAT partition and the camera's proprietary firmware. If the camera lost power during a write cycle—which often happens during a power flicker or a hard reboot—the file index (the map the camera uses to find videos) becomes mismatched. This means the video data is physically on the card, but the camera cannot find the start or end points of the clip, triggering the corruption alert.

How to Fix It

To resolve this, you must perform a low-level format specifically through the Lorex hardware to reset the allocation table. Follow these exact steps:

1. Open the Lorex Home app on your mobile device and select the specific 4K Spotlight camera that is experiencing the playback issue.
2. Tap the Settings (gear icon) in the top right corner of the live view screen.
3. Navigate to Storage Management or SD Card Settings.
4. Select Format. When the confirmation prompt appears, tap Confirm. Wait for the "Format Successful" notification; do not close the app or power off the camera during this process.
5. Once formatted, go back to the main camera settings and ensure Overwrite is enabled. This prevents the camera from stopping recordings once the card is full, which can sometimes lead to index errors.
6. Restart the camera by unplugging the power adapter for 30 seconds and plugging it back in to refresh the mount point of the SD card.

If That Didn't Work

• Perform a PC-Level Format: Remove the microSD card from the camera and insert it into a computer. Use a tool like "SD Memory Card Formatter" (from the SD Association) to perform a "Full Overwrite" format rather than a "Quick Format." Set the file system to FAT32 for cards 32GB or smaller, and exFAT for cards 64GB to 256GB. This clears deep-level corruption that the camera's internal software cannot reach.
• Verify Card Speed Class: Check the physical printing on your card. If it does not have a V30 or U3 symbol, the card is too slow for 4K bitrate streams. The camera will write the data, but the "bottleneck" causes dropped frames and corrupted headers. Replace the card with a SanDisk High Endurance or Samsung Pro Endurance microSD card.
• Check for Physical Oxidation: Inspect the gold contact pins on the back of the microSD card. Use a lint-free cloth and a small amount of 90% isopropyl alcohol to clean the contacts. Dust or oxidation on the pins can cause intermittent connectivity, leading the camera to report the file as corrupted when it actually just lost the connection for a millisecond.
• Update Camera Firmware: Go to Settings > Device Information > Firmware Update. If a version update is available, install it immediately. Lorex frequently releases patches that optimize how the camera handles SD card write-cycles and file indexing to prevent these exact playback crashes.

Heads Up

• Avoid Generic Cards: Never use "unbranded" or ultra-cheap microSD cards. 4K recording requires high "random write" speeds; generic cards will fail within weeks of continuous 24/7 recording.
• Capacity Limits: Ensure your card does not exceed the maximum supported capacity (typically 256GB for most Lorex 4K models). Using a 512GB card may cause the camera to fail to mount the volume entirely.
• Power Stability: If your camera is prone to power surges, consider a small UPS or a high-quality surge protector. Sudden power loss during a write operation is the number one cause of permanent SD card corruption.
• Periodic Maintenance: It is a best practice to manually format your SD card every 3-6 months. This clears out "ghost" files and optimizes the file system for better playback performance.