If your computer is not recognizing your external SSD, several factors could be contributing to the issue. Here are steps to troubleshoot and potentially resolve the problem:
Check Physical Connections: Ensure that the USB or other connecting cables are securely plugged into both the external SSD and your computer. Try using a different cable or port to rule out a potential hardware problem.
Power Source: If your external SSD requires an external power source, make sure it is properly connected and functioning.
Drive Management: Check if your external SSD is listed. If it is, it might need to be assigned a drive letter.
Device Manager: Open the Device Manager on your computer and check for any yellow exclamation marks next to your external SSD. This could indicate a driver issue. Update the driver or reinstall it if necessary.
Try Another Computer: Connect your external SSD to another computer to see if it's recognized. This can help determine whether the issue is with the external SSD or your computer.
Check for Compatibility: Some SSDs may require specific drivers or firmware updates.
Software Conflicts: Certain software or antivirus programs may interfere with the recognition of external devices. Temporarily disable antivirus software and check if the SSD is recognized.
Update USB Drivers: Outdated drivers can lead to connection issues with external devices.
Test with Another Port: Try connecting your external SSD to a different USB port on your computer. Sometimes, specific USB ports may be faulty.
Format the SSD: Be cautious as formatting erases all data on the drive. Backup data before attempting this step.

In such cases, contacting the SSD manufacturer's support or seeking assistance from a professional is recommended.
Read also: Why does my computer display a 'No Bootable Device' error