Just to confirm — you have two HDDs in Slot 1 and Slot 2 of the D8 Hybrid, and you created a RAID 0 using the D8 Hybrid's hardware RAID, is that correct?
Could you please let us know which TOS 7 version you are currently using, as well as the Storage Manager app version? (You can find this in the App Center.)
If your Storage Manager version is lower than 1.0.062, please update it to fix an issue in older versions where NTFS USB drives could not be mounted.
If your situation does not match the above, and the suggested steps do not resolve the problem, please contact us online to schedule a remote session with an engineer:
https://salesiq.zohopublic.com/signatur ... 97d0be8892
If you are short on time at the moment, you may also consider collecting a system report via TOS > Support and Help > Report Issues and sending it to our technical support email for analysis.
To contact our team, please send email to following addresses, remember to replace (at) with @:
Technical team: support(at)terra-master.com (for technical support)
Service team: service(at)terra-master.com (for purchasing, return, replacement, RMA service)