Windows 7 System Image restore very slow, AHCI vs IDE

I was testing a Windows 7 Image backup, and the restore process was taking forever. It should have taken about 30 minutes, and after an hour (when I stopped it) I estimated (using the number of progress bar ticks) it would take about 2 days to finish. I rebooted and in the BIOS settings I changed the SATA Emulation from AHCI to IDE (there are AHCI, IDE, and RAID) and tried the image restore again. The restore proceeded normally, it took about a half hour, but when finished the PC would not boot. It looped, trying to IPL. I changed the SATA Emulation back to AHCI and everything it booted ok and everything seems to work fine. I went to another PC and tried, it only boots in AHCI mode an not IDE mode (there is no RAID option).

Any ideas why I am having a problem with this? Full disclosure, I used a different PC's recovery CD (the second PC mentioned above) to boot and perform the image restore. Could that be causing the very slow restore performance or does the AHCI/IDE issues indicate a more fundamental problem?

Edit: I looked on my home PC, it has IDE, AHCI and RAID modes. It is set to RAID and will not IPL when set to IDE or AHC.
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AHCI is faster then IDE but that doesn't really explain the 2 day restore. I think that is a fluke.

As far as after the restore you can usually get away with restoring a AHCI backup to an IDE computer because the IDE driver is already loaded by default. You can't get away with restoring a IDE back to a AHCI computer because the AHCI driver is not loaded by default so it crashes because it can load the AHCI driver. You can do it is you use some king of third party utility that will let you insert the AHCI driver at the time of the restore.

What did you back up to? A USB hard drive?
i would run a diag on the drive - find the model in device manager, and run the manufacturer's diag tool
i use the ubcd for this :
Hardware diagnostic CD    UBCD
go to the download page, scroll down to the mirror section, and  click on a mirror to start the download
Download the UBCD and make the cd   <<==on a WORKING PC, and boot the problem PC from it
Here 2 links, one to the general site, and a direct link to the download

since the downloaded file is an ISO file, eg ubcd527.iso - so you need to use an ISO burning tool
if you don't have that software, install cdburnerXP :

If you want also the Ram tested - run memtest86+ at least 1 full pass,  - you should have NO errors!
direct download :
For disk Diagnostics run the disk diag for your disk brand (eg seagate diag for seagate drive)  from the HDD section -  long or advanced diag !  (runs at least for30 minutes)      

**  you can make a bootable cd - or bootable usb stick
*** note *** for SSD drives  use the tool from the manufacturer, like intel 's toolbox :

for completeness -here's how i handle disk problems :

==>>****in order to be able to  boot from CD or usb - you may have to disable secure boot in the bios
MikeBroderickAuthor Commented:
I was using a repair disk that I made on another, similar PC. I made a repair disk on the same PC and that fixed the problem.

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if you did not tell us that - how are we supposed to know Mike??
MikeBroderickAuthor Commented:
I apologize; looking back I noticed the word CD is missing from a sentence in my original question: "... I used a different PC's (the second PC mentioned above) CD to boot and perform the image restore. ".
MikeBroderickAuthor Commented:
Sorry for any confusion.
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