First post on this board! I've seen one very similar to mine, but not quite the same:

I have a SP0802N hard drive which I have been running as a secondary hard drive under XP Pro with no problems since earlier this year. When I install SP2 it no longer appears. It is in Device Manager, but within Disk Management it shows as Offline. I cannot reactivate it - in System Event Viewer I get the messages "Internal Error - The disk group contains no valid configuration copies (C10000B6)" and "Disk group ComputerDg0: Errors in some configuration copies: Disk Harddisk1, copy 1: Block 256: Invalid magic number in the configuration copy". I could probably convert it to a Basic Disk but would then lose all my data (30 odd Gb worth!). It's a Dynamic Disk on NTFS.
If I do a System Restore to the point before installing SP2 it appears again!

What can I do to get it back please?!!!!

Ive only seen this error when disks die! Not normally 'death by SP2' mind
I guess there are two easy options:

1- stay on SP1
2- rollback to SP1, move the data to the working disk, change back to a basic disk then load the data back on. Go back to SP2 and prey it works!

I am assuming that this disk is a simple volume? If so I suppose you may as well just have it as a basic disk. Of course if it is mirrored, striped etc then thats a whole different story!

Thanks for your reply.

It is a basic disk. I was thinking if all else fails then I would try what you suggested and format it and start from scratch. I jsut think it very strange that something that will work in about 10 minutes time if I roll back to SP1 won't work now!!!!

Very true- and I am sure there is an explanation for it somewhere.

I've just spent a whole day getting a MS Access database to work properly (its an awful thing to 'develop' in) and rest assured things just break for no apparent reason all of the time!

Lets face it- it could be so much worse judging by the other SP2 posts that have reared thier ugly heads.

If i get some free time soon I'll have a further dig around and see if we can formulate a solution.

Even if you solve your problem in the meantime I am sure we will all end up just that little bit cleverer by the end of it!

Thanks! For now, I've rolled back to SP1 (System Restore is a wonderful thing!)

Presumably, seeing as I have disabled Messenger, use Firefox with all Pop-Ups blocked, and have F-Secure Anti Virus and Firewall, there isn't that much more (if anything) I would get from SP2 anyway is there?

APK - does that mean you solved it? If so, how?!!

Right! I'm with you now!