300 GB SATA drive doesn't appear in disk managment

I have PE SC1420 with Raid 1 80GB. I recently bought a Maxtor SATA 300GB, I connected I can see it when the server is booting but when I go to Disk manager to configure it I only see the 80GB one not the Maxtor.
Any suggestions please
sillcAsked:
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jamietonerCommented:
the intergrated sata controller also has a raid option, make sure the integrated raid is turned off in bios.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Not sure about the PE 1420, but in most systems I've seen, if you use on board RAID, then on-board non-RAID controllers are disabled.  Check your BIOS and/or consider buying a SATA PCI controller.
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sillcAuthor Commented:
it came with CERC 6 channel SATA RAID controller (internal) and the first two HD are conncted to it and they work fine, and like I said in my earlier post BIOS can see it while booting.
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jamietonerCommented:
since you have it connected to a raid controller is has to have an array configured on it to be recognized in disk management so just create a raid 0 on the single hdd or simply plug it into one of the sata controlers on the motherboard.
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sillcAuthor Commented:
:) it is connected to the the SATA controller and that is why during booting BIOS is recognizing it, but not when I go into windows ... but thanks for your input
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sillcAuthor Commented:
Thanks jamietoner I thought I did setup RAID0 it seams I exited without saving or something, as soon as I setup RAID0 went to device manager and configured the drive.
Thank you.. good job
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jamietonerCommented:
No problem
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