My computer won’t recognize the JDM855/850.

Category : Setup / Operation

If you see the above error message in Disk Utility, it is because the JDM had not been safely ejected, which led its format to become unstructured. You can take either one of the two following measures to troubleshoot:

1. Repairing and Remounting the SSD (Not applicable to SSDs using the GUID format)

Step 1. Select “Show All Devices”.

Step 2. Run “First Aid” on the higher-level JDM.

Step 3. Run “First Aid” on the lower-level JDM.

 Step 4. Mount the lower-level JDM.


2. Erasing the SSD (Applicable to all formats, but will format the SSD and erase all data from it.)

Step 1. Select “Show All Devices”.

 Step 2. Run “Erase” on the higher-level JDM.


*Always safely eject your external devices to minimize the risk of data loss.

Is the answer helpful?

Technische support

If the answer can't help you, you can contact the Tech Support Department


U hebt al cookies geaccepteerd, maar u kunt uw toestemming op elk gewenst moment intrekken. Zie voor meer informatie onzeCookie Statement. Instellingen veranderen

U hebt cookies al geweigerd, maar u kunt op elk gewenst moment uw toestemming geven. Zie meer voor informatie onze Cookie Statement. Instellingen veranderen