Hi, I've been trying several times to set up a Raid 1 Mirror ontwo identicaldata drives (non-boot) from Windows 7 Ultimate (which succeeds initially) butI keepencountering a "Failed Redundancy" error on the drives as soon as I access the data on it. Does anyone have any idea what the problem might be?Here are the steps I've taken:1)FromComputer Management/Disk Management, Iselected "New Mirrored Volume" from the context menu to start up the wizard2) Went through the steps in the wizard and selected two identical unallocated drives and had them formatted3) It now shows that these drives are mirrored and the individual drives are both "Healthy"4) I copy data to the mirrored drive without any issues4) Then when I access the mirrored drive to access data on it, they will then show a "Failed Redudancy" error message and a yellow warning icon on one of the individual drivesI've tried several times re-syncing and starting from scratch again but I run into the same problem every time I access data on the drive and can't figure out what the problem might be.Does anyone have any ideas? Any help would be greatly appreciated.Thanks,PortableFishy

Not having done just what you're doing, I'm answering blind here, but it seems possible there really is a drive error occurring...Does the warning icon always show on the same drive?Have you run any diagnostics on the drives?-Noel

I have not done this in Windows 7 either.But I have done it enough on Windows Server, from NT 4 through W2K, AS, 2003, 2003 R2, 2008, and2008 R2 (which also could be called Windows 7 Server). However, I don't think I have ever created the mirror from scratch. If I did it was in the last century. I have always mirrored an existing volume.I think Noel could be right, that there could be a hardware problem. First, check all connections. Any cables that seem loose should be replaced. Then, if you have the manufacturers diagnostics for the drives, you can boot the cd and test each drive. The drive manufacturers usually have ISO images with diagnostics that you can download if you don't have them. It doesn't hurt to have the most recent version, anyway.If the drives test ok, then check to see if there is a driver problem. Open Device Manager and see if there are any items showing a warning icon. See if there are any updates available for the drive controller(s).See if one of the drives is ok by itself. Reformat it and copy some data to it. See if you can copy data back and if there are any errors. Then try adding the other drive to it as a mirror.The other drivecan be unformatted at this point. In disk manager, right click the existing volume and select Add Mirror.It should show you a list of available drives, probably with just that one drive. Once you select it and ok it, it should show the mirror in Disk Manager, with both drives as "Resynching". After a while, it should show a percentage of completion. Depending on drive sizes, this can take a long time, but you can use the mirror all the time.I did thiswith a 500 GB mirror two days ago. It is still resynching, but I have shut it down at night. It starts over when you reboot. I guess I'll leave it on tonight. It is 33% complete after about 7 hours so it should be dome tomorrow.

I did a disk check on both of the drives, and noticed that one of them slowed down significantly at one point during the check. I'm guessing there is a problem with this drive (although it doesn't seem to be fatal on its own). I'll try setting up Raid 1 from Windows 7 again after replacing the drive and hope it'll resolve it!

If it is an IDE drive, check the power plug.Some of these plugs get loose after being plugged in and out a few times. You can tighten them up by shoving a small (<3mm) screwdriver in to each hole in the plug, outside of the conductor, between it and the outer, insulating plastic. Make sure the PS is unplugged first.If it is SATA, the data cables and power adapters you get with some of the drives leave a lot to be desired. When they don't have latches they can get loose very easily. You can get good, latching cables from Newegg for about $1.50.

PortableFishy - Try running SpinRite against the drive (see www.spinrite.com) and also run the MFG drive utilities. I've saved numerous drives using SpinRite but have encountered three drives that were defective (this is out of 80+ drives I've run SpinRite against), they passed the MFG drive test but fail in SpinRite 100% of the time at level 4 but when I ran level 1 it flagged the possible bad areas then when I used SpinRite to target the flagged areas SpinRite crashed due to drive errors it could not correct.