have been using win 7 for a while now without much dramaat all. In fact I was thinking about wiping my vista installation.But ...today I get a BSOD on first boot and this one was different to the "norm" it was a 0x24 stop error and after a reboot I am welcomed with a screen asking if I want to boot normally or repair, a normal boot results in a stop 0x7f in ataport.sys - I didn't get much further with the repair options either, chkdsk won't see the disks (I don't have the drivers to load) and none of the other options get me very far either.With the Vista HDD back in and the win7 disk on a non-boot sata port chkdisk runs automatically and corrects a whole bunch of errors on pretty much every partition, I'm now running again in win7 but the system log is full of: The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume \Device\HarddiskVolume6. The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume O:. Unfortunately, I don't know which physical disk or partitionVolume6 is, i.e. not listed in disk manager but I'm guessing it's an as yet unlabelled but empty formatted partition on the same disk as C:Is this a driver issue, win7 bug,disk faultor controller h/w fault? (h/w fault less likely as Vista is quite happy with the whole setup). This has knocked my confidence a bit, a timely reminder that as good as it is, it's still RC code.Another oddity is that windows no longer recognises my DVD-RW drive (it's connected to another SATA controller to the afore mentioned HDD), it was working fine previously. Device manager has the exclamation mark andsays no drivers are intalled but the driver tab shows a driver is there ("update driver" says the driver is up to date)and "scan for hardware changes" just hangs.The purpose of this thread is really to see if diagnosing this will be of help to anyone else. I see a few dicussions mentioning "file system structure ..." but nothing that recent and usually refering to installation issues. Think I'll retreat to the safety of Vista for a while and maybe re-installas well as test the HDD thoroughly.Config:Windows 7 x64 build 7100Gigabyte GA-EP34-DS4r2.18GB DDR2INTEL E8400 (@ stock settings)ICHR RAID Controller (on board) with: RAID 5 array - 4x500GB - drive O: 640MB HDD as non raid disk with 100GB partion as C: (plus an empty200GB NTFS primary partition and 300GB unallocated)Gigabyte AHCI onboard controller with DVD-RW attachedRunning AVG AntivirusFoolishly, I just asked disk manager to delete the 200GB partition and that's just sitting there doing not very much now. I hope it's just the HDD but does that explain all the other errors?CheersRich