Originally posted by: Pepsi90919
...how?

i can't boot into anything useful
Edit:
I just remembered that you are working in Vista. I really have no idea if the "standard ways" of handling Dynamic Disks will work with Vista. Also, remember that slight changes have been made to Vista, so that most current disk management programs (Partition Magic, et al, won't work unless they have been re-designed to work with Vista. So check before assuming that a "free recovery program for converting my accidental dynamic disk back to basic disk" will work.
You should be able to add the drive as a secondary (non-system) drive on another Windows PC, scan for it, reboot, and, if necessary, "import foreign disk" into the new Windows system. Once you get the data off, you can reformat your drive and re-install Vista on your PC if necessary.
I'm NOT a dynamic disk expert. I avoid them like the plague. I just finished helping a new client recover from losing their Dynamic RAID 5 array. It cost them about $20,000, total, to recover from having two out of four drives fail semi-simultaneously.
Mainly, be REALLY careful about what you do with this disk. Microsoft has some whitepapers on dynamic disk operations. And, obviously, don't ever click on "format the disk."
