Over in this thread is a discussion about problems with restoring partitions, which includes this statement by (very helpful) member k0lo: I'm still not exactly sure I understand the "simple to avoid this" part, but at least am pleased that (owing to this board) I seem to have solved an issue with my XP-based P4 PC that's been a workhorse since about 4 years ago now. For several months I've been experiencing odd BSOD problems among which appeared PAGE_FAULT_IN_NONPAGED_AREA. What's been odd to me is that this PC has almost never failed in actual use, i.e. I can run complex processes and test programs on it that take days to run and it just runs perfect. Only when I shut-down or re-boot or enter-or-leave a sleep state would I get a BSOD. So it's been annoying/disturbing to me, but not a "killer" problem, ya know? But having recently experienced an issue where TI (v7 in my case) didn't want to restore a .tib to my hdd, giving a message like "you can't restore an image to the same drive, you dummy" (I added that last part) I started looking into this question of "drive letter problems" that I've been reading about here on the Wilders board. Well, to make a long story longer, I've used this PC for years, swapping drives in-and-out and using more recently one of those USB-to-IDE/SATA converters also, and I discovered that my HKLM\System\MountedDevices key had 170 entries in it! Thinking that might be confusing Windows some times (d'ya think?) I deleted the key and re-booted and now have a more reasonable 16 entries (I have 4 ides and a SATA and three or four USB gizmos I plug-in occasionally). Another thing I realized (I think anyway that this has been my BSOD problem) is that I've had my main PageFile set-up on my E: drive, a 2nd physical hdd from the C:\System drive that of course has XP on it. Here's the problem though: I HAD CHANGED THE DRIVE LETTER OF THIS DRIVE TO E: MANUALLY, USING WINDOWS DISK MANAGER. I did this because, being the anal person that I am, I wanted the 2nd (logical) partition on my Drive 0 to be D: and my 2nd Hard Disk w/a single Primary partition to be E:. But now I've found that the algorithm Windows uses to assign letters naturally goes like this: Primary partition (startup) gets C: Next Primary gets D: Next Logical gets E: etc. Well, my drive 0 had been set by me to have the 2nd partition set as D: and the drive 1 primary partition set as E: which is bass-ackwards from what Windows would normally assign/expect. So I now BELIEVE that Windows got confused sometimes when it went looking for my paging file, expecting it on E: but instead of finding it on my Drive 1 was looking for it on Drive 0 1st Logical partition ("natural E:"). I've changed my setup to now go with the natural algorithm and haven't had a BSOD since. I hope k0lo finds this thread and offers his explanation of "simple to avoid drive letter problems" cuz altho I've gotten alot smarter lately about this stuff I'm still not sure what that comment refers to specifically. I'd be curious too if others here have a monstrous MountedDevices key in the computer they've used to make backups. I think mine was confusing Windows no end. Sorry for the long post but I just had to get this off my chest!