RAID1 rebuilding failed and reboot

I got Windows7 Ultimate and using RAID 1 which is using BIOS \ Intel RST feature.

Then one of the HDD failed last week so then we replaced with new HDD and started rebuilding but then for some reason it rebooted and failed the Rebuilding process. But it failed to recognize the old hdd working hdd and luckily it has copied the whole on to new one. So were able to boot windows from the new hdd.
So then today I got replaced that HDD and then started rebuilding process and this time it rebooted but could not login to windows. So then new hdd replaced today was able to boot it by going into safe mode and then booted normally. And then disconnected the failed hdd.
Now when I connect the failed RAID hdd to the another working computer as a slave and it's working fine.
In a nutshell, its failing when rebuilding the RAID1 with new hdd. The status for RAID1 in BIOS shown is Degraded.

Information Helpful
- Windows 7 Ultimate 32 bit
- 8gb Memory
- Gigabyte Motherboard (Motherboard GA-Z68X-UD3H-B3 Intel Z68 Socket - Gigabyte)
samsolutionsAsked:
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Mal OsborneAlpha GeekCommented:
Probably worth taking a look at your PSU.  Low or noisy 12v supply can cause HDDs to repeatedly fail like that.

Either whack on a DMM and CRO, or try a new one.
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samsolutionsAuthor Commented:
you could be right but it had not failed the other HDD but reboot the pc and failed the Raid process.
The other point is it has failed the Raid process on two different Sata and Power port.
and also the computer been going great from 4 years.
so just thinking will the psu still be in question.
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samsolutionsAuthor Commented:
The first HDD has failed and that's where it started. But the other Two HDD failed to rebuild the RAID and made the computer to reboot. And one instance it reboot ok with Degraded and the next instance the drive was unbootable. And so remove the new hdd and reboot with safe mode and then got into it.
So leaving the first HDD hardware failure; the other two are working when connected as a slave on other windows pc and the data was copied as well.
What I am thinking is if the PSU is faulty it could have damaged hdd?
Also let me tell you that somethime pressing power button does not turn on and had to turn off and on switch from the PSU and then try and it goes then. But then looking the other symptoms and the way computer is going its not pointing to the PSU. So furhter analysis or expert comment would be helpful.
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rindiCommented:
NEVER EVER use the RAID functions of those crappy onboard fake-RAID controllers. They are total crap, unreliable and perform badly. Rather change the setting of the SATA controller to AHCI in the BIOS, then setup RAID 1 within diskmanagement of your OS. That is much, much more reliable, and performs a lot better. OS built in RAID can read data from both disks simultaneously and patch it together, which gives you a high read speed, and that no fake-RAID controller can do. Even real RAID controllers usually can't do that, or not as efficiently.
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samsolutionsAuthor Commented:
if I change the Sata Controller to AHCI in the Bios will the windows still boot from the Degraded Raid HDD which working at this stage.
can you list the steps to follow.
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rindiCommented:
Just try. If the correct drivers are installed, there should be no problem booting into Windows.

In diskmanagement convert your disk from basic to dynamic (if it isn't already dynamic). After that just add the other disk and you should be able to add it as a mirror.
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samsolutionsAuthor Commented:
still working on it and should come back in couple of days to post the comment.
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samsolutionsAuthor Commented:
I was reading an article from Intel saying that changing from RAID to AHCI will make the HDD unbootable. And advised to go into the BIOS and then by pressing Ctrl + I where make the changes "Reset Disks to Non-Raid" and that will keep the HDD bootable to windows but the mirroring will stop.
Here is the link - https://communities.intel.com/thread/48706

if anyone is sure about and had an experience \ certainity then please let me know. As this is production 24 x 7 computer so can't play much.
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samsolutionsAuthor Commented:
It was worth to use the Disk Management function for RAID1 then the built-in Motherboard RAID. But changing from RAID to AHCI will make the Disk unbootable so got to be careful.
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