My Win 2008 R2 Server will not boot unless I have a 5th sata drive.
Here is how I got into this trouble...
I have ASUS P88 WS motherboad
I have a pair of RAID 1 drives for the C-Drive (Win O/S)
And a pair of RIAD 1 drives for the E-Drive (Data)
One of the C-Drives failed. So I added a new drive to rebuild the raid - which worked.
I then mistakenly thought the broken drive may be ok - So I plugged it into SATA port 1 (which in theory is a Non-Raid sata port). I thought I may be able to low level format it (but didn't get far).
NOTE: the "broken" drive is definitely NOT part of the Intel Raid - its serial# shows as a Non-RAID in the Crtl-I screen. And the other 4 drives all correctly show as part of the two RAID volumes. Also this is confirmed in the Intel Matrix Storage Manager Screen.
Now if I remove the "broken" drive then Windows won't boot.
I guess I can live with the "broken" drive chewing up power. But it bothers me.
How can I remove this drive.