Online
DiskPart
This is from Microsoft Technet. If you want to see it at their site, click here
To access DiskPart, click here
Syntax: online [noer]
Brings an offline disk or volume with focus online. Resynchronizes the mirrored or RAID-5 volume with focus.
noerr
For scripting only. When an error occurs, specifies that DiskPart
continues to process commands as if the error did not occur. Without
the noerr parameter, an error causes DiskPart to
exit with an error code.