Hi there! I understand that you're having trouble getting your CooDisk flash drive recognized by your iPhone, Mac, and iPad. Let's work through this together.

Here are a few simple steps we can start with to troubleshoot this issue:

1. Check the Connection: Make sure the flash drive is properly connected. If you're using an adapter (like Lightning to USB), ensure it's functioning correctly.

2. Test on Different Devices: You've mentioned that it's not recognized by any devices. Can you try connecting it to another Mac or iPhone if possible? This will help to see if the issue is with the flash drive itself or the devices it's connecting to.

3. Restart Your Devices: Sometimes, a simple restart can help. Please restart your iPhone, Mac, and iPad, then try connecting the flash drive again.

4. Format Compatibility: If the flash drive is formatted in a file system that is not supported by your devices, it won't be recognized. CooDisk usually requires it to be formatted in exFAT or FAT32. Do you know how the drive is currently formatted?

5. Update iOS and macOS: Ensure that all your devices are running the latest software updates. Sometimes, compatibility issues are resolved with updates. You can check for updates in:
- On Mac: Apple menu → System Preferences → Software Update.
- On iPhone/iPad: Settings → General → Software Update.

6. Try a Different USB Port (for Mac): If you're using a Mac, try different USB ports just to rule out a single port issue.

7. Contact CooDisk Support: If the drive still isn't recognized after trying these steps, it may be beneficial to contact CooDisk support directly.

Could you let me know if you've tried any of these steps already, or if there are any unique details about the issue? This information will help me guide you better.