Raid: "Error On Member Disk(0)"

[Culinia]

Hey guys.

This has happened to me once before.

Intel management (control+i thing) lists one of HDD as red error:
Member Disk Error(0)

What is causing this? Has one of them failed? Don't think it has since I have booted up now.
Last time I just reinstalled the OS (W764) and all was fine until now and would prefer not to reinstall OS.

Thanks for any help.

 

[Culinia]

Thanks.

Has not come up again.

Take it everything fine?