You 1) need the drive controller driver, 2) need to configure RAID first, or both.  What controller are the drives connected to?  Onboard SATA?  An add-in card?  If a card, which one - a SAS 5 or a PERC 5?

Are you installing the standalone Hyper-V? or a Windows Server with Hyper-V?  If Server, which one?

Thanks for the replay TheFlash ..

The WD hard drive is connected right to the mother board and i am tring to install the stand alone verison of Hyper-V .. hope that information helps .. and thanks for your time and help also ..

Try this driver:

www.dell.com/.../precision-490-dt

It is for Vista 64-bit (the highest OS supported on the 490), but may still work.  Be sure to extract the contents of the driver before using at the Load Driver link during the install.  If that doesn't work, then tell me a little more about what you see.  Is the disk(s) visible in the BIOS Setup (F2) or in another utility like CTRL-I or CTRL-C?

thanks for the advice again .. just tried it and still nothing keeps giving me the same error about not finding everything .. you can see the disk in the bios because I installed Xen Server, and ESXI server on the same computer with no trouble its just Hyper-V that doesn't see the hard drive .

Did you actually run the EXE to extract the files, THEN put the seven files it extracted onto USB/CD/floppy to search for during the install?

The Error is the following

No New device drivers were found. make sure the installtion media contains the correct drivers, and then click ok ..

that is all i ever get with every driver i have tried so far ..

"you can see the disk in the bios"

I was asking this, not because the system can't see the drives, but because if these drives were being handled by another controller, they would NOT be seen in the BIOS.

So, if you can actually SEE them listed in the BIOS Setup (F2), then they are being handled by the chipset controller.

"keeps giving me the same error about not finding everything"

What is the EXACT error it is giving you?  "Everything"?

Yep .. first thing I though of ... and I can get to the screen during the install that lets me load the drivers and there are a bunch listed , but no matter which one i pick nothing ever picks up the hard drive ..

Ok ...

Try the latest driver from Intel (since Dell does not support Windows 7 or 8 (and no Server OS's), the Vista driver is the latest Dell offers, and may not be sufficient):

Intel Rapid Storage Technology (use the "f6flpy-x64.zip" version - or even try the "iata_enu.exe", but it should not be necessary)

If that doesn't work, boot to the BIOS Setup (F2), SATA Operation, change to Autodetec/ATA or Combination ... this way is not ideal, but will probably work.

Thanks again Flash ,

but honestly stil nothing .. I checked the BIOS and the hard drive does show up ...

I checked the Sata Opteration and its set for " Raid Auto / ATA " the only other optinos are " Raid Auto / AHCI " and "Raid On "

I changed it from ATA or AHCI and tried the both the drivers again with no luck ... Only thing left I guess is to intall server 2008R2 or 2012 and run Hyper-V that way .. but kinda wanted to run it as a standalone ..