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Asus motherboard harddrive not detecting

I have 2 harddrives on my computer. Both have windows 7 loaded on them but one has more current data. Let's call it drive 1.  Well when I reboot the bios/disk controller will not detect drive 1 so it boots to drive 2 (old data).  I've checked the boot sequence an boot.ini i belive is correct with drive 1 listed first  any other options? If I hit f8 on reboot it detects drive 1 just fine.
3 Solutions
David Johnson, CD, MVPOwnerCommented:
boot.ini is not applicable for Windows 7 or any windows 6.xx version.

Well when I reboot the bios/disk controller will not detect drive 1 so it boots to drive 2 (old data).
That tells me that that drive is problematic. I'd consider replacing it ASAP as it is not spinning up quick enough.. some bios's you can edit the wait for ide drive time and increase it.
TechyTAuthor Commented:
Okay, we'll why would it detect on reboot though? Drive already mounted or something? An as for boot.ini I was going by the boot section in msconfig figured was same.  Thanks
David Johnson, CD, MVPOwnerCommented:
on reboot it will find it on reboot since it was given time to spin up.  From a cold start the drives are not spinning and initialized in the hard drives controller which then passes the information to the bios when requested.  on a reboot the drives have not totally spun down ergo they initialize a lot quicker.. this drive is not up to spec and takes longer to spin up and initialize ergo it should be replaced.
Ian MeredithCommented:
You should be checking the BCD (boot configuration data) to verify your hard drive boot sequence in Vista/7.  
Use this freeware tool   http://neosmart.net/EasyBCD/
I would check if it's a SATA III drive, often you can jumper it to SATA II mode and the motherboard will recognize it again.

What motherboard is it, and what hard drive model?

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