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Windows 7: to system partition or not to system partition

04 Jan 2011   #11

windows 7, mac os X

ok i started up in safe mode and it seems to be crashing at classpnp.sys>??

My System SpecsSystem Spec
04 Jan 2011   #12

Windows 7 x64 Ultimate

It's begining to sound like there is a problem with the drive :/

But, to simplify things when you do clean installs, unhook all other hard drives including any cards stuck in card readers or thumb drives. That can cause stupid install error messages or funky drive letter assignments.

But when it syas there is no "system partition" it's talking about the windows root/boot partition (Not the 100 Meg system reserved partition). If you did a clean install and then rebooting gives you that error, it's either the BIOS not finding the drive you just installed onto, or somehow the drive is not in the BIOS "boot sequence". Or it's a bad cable, flakey power, bad drive or something like that.

I'd try to start from scratch. Unkook all other drives, look at the motherboard manual and find out what is sata controller #1 and plug the drive into that (Don't use any specialised ones like the marvell controller, just the standard intel one). Make sure in the BIOS that the drive shows on on boot and that it is selected first in the boot order, DVD drive second. Then reinstall clean (Besure to delete and recreate the partition when reinstalling).

Then after thats done if there is still more random flakiness then it's some kind of hardware issue :/ Besides what I meantioned above it could also be the MB or power supply when all is said and done (I just had a total nightmare PSU issue that took days to wade through).
My System SpecsSystem Spec
04 Jan 2011   #13

windows 7, mac os X

i was able to get into safe mode after changing my set up back to AHCI and windows boots as well normally .. GREAT now i cant turn on my RAID DRIVES.. this is beyond wack. I suppose i have to reinstall once again in RAID mode on my intel controller.. I cant beleive this.. im assuming because i installed in AHCI mode its only working now in AHCI mode.
so im booted up right now looking at my system. but, i cant enable any of my raid drives which have 90% of my data. LOL what a day what a day.
My System SpecsSystem Spec

04 Jan 2011   #14

windows 7, mac os X

is there a page i can check to fully understand what differences are happening in the bios when changing between AHCI and IDE and RAID..??? I dont really understand what achi is other then it stands for Advanched host controller interface?? as far as i know i think it enables hot swapping of sata drives??? i think i read something to that effect anyway..i had no idea that it could have this osrt of impact on whether or not my system is startable.. wow
My System SpecsSystem Spec
04 Jan 2011   #15

windows 7, mac os X

am now reinstalling win7 64 bit, this time i made sure both my controllers are in raid mode, and i loaded the intel RAID/AHCI driver from usb disk during install. hoping that will make a big difference???

something tells me ill be reinstalling on my amd box too because im not sure if its set up in raid mode already, and if this is the reason for all my trouble today then id probably have the same thing happen to me when i try to install a raid on that box.. ugh
My System SpecsSystem Spec
04 Jan 2011   #16

Windows 7 Home Premium 64bit

Do you have 2 Vertex Drives you are trying to RAID? Or a single Vertex for the OS, and trying to RAID other drives along side it?

If a single SSD, Set it to ACHI, and as already suggested, disconnect all drives except the Vertex.

Make sure it is plugged into SATA Port 0 (or the very first 1)

Do the clean cmd, and install Windows.

Once you get windows up and running, then set up the raid on the other drives.
My System SpecsSystem Spec
04 Jan 2011   #17

windows 7, mac os X

hi wishmaster, i do have 2 ocz vertex ssds. i had them installed as raid before and had no problem at all.
but ive now split them apart and using them on the individual boxes singularly. and now im running into these problems on only one of the boxes.. my intel box. the amd installed fine and seems to be solid in its stability by comparison.

i was able to install fine when ihad the drive set up as AHCI as u just indicated... but there is 6 sata ports and i have only one setting for all of them i believe. i cant set up one of them as ahci and the rest as raid?? or can i?
My System SpecsSystem Spec
04 Jan 2011   #18
Mike Connor

Several, including Windows 7 x64 Ultimate

If you change your BIOS drive settings you will have big problems!

You CAN change from AHCI mode to IDE without a problem, but other changes will cause you a lot of headaches.

There is a trick to changing IDE to/or back to AHCI


set "Start" to 0 .

Re-boot and set BIOS to AHCI.

Once the machine is running install the original AHCI driver. You may also have to alter the "BOOT order" of your discs in the BIOS if the machine fails to boot.

It is not normally possible to install a RAID configuration after an OS installation, ( although it will work on some Gigabyte boards, these boards also allow "mixed operation" of types, and later RAID additions).

Further information;

How to recover a RAID 0 disk array after losing the array

For data recovery;

FREE Freeware Data Recovery Software Full Versions

Regards....Mike Connor
My System SpecsSystem Spec
04 Jan 2011   #19
Bare Foot Kid
Microsoft MVP

W 7 64-bit Ultimate

My System SpecsSystem Spec
04 Jan 2011   #20
Microsoft MVP


Please post back a screenshot of your maximized Disk Mgmt drive map with listings, using Snipping Tool in Start Menu. Tell us what is on each partition.

Be aware that we see a steady stream of RAID install problems here. Better to install to a single HD plugged to SATA1 and use other HD's for storage unless you know that you can improve performance on Win7 with RAID - as most report no performance increase, and no real redundancy since you can lose everything with one HD fail in many RAIDs. Win7 built-in drive imaging is better redundancy.
My System SpecsSystem Spec

 to system partition or not to system partition

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