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Windows 7: cloned C:, installed AHCI drivers, changed BIOS to AHCI, D:'s GPT gone

23 Nov 2014   #1
rancur3p1c

Windows 7 Business x64
 
 
installing AHCI drivers and changing BIOS to AHCI I lose D:'s GPT

see second post.

I have a 3TB drive D: for data formatted with GPT.

Had BIOS OnChip SATA Type set as "RAID" "As SATA Type" from back in the day. When I took out the RAID, I forgot to change this to AHCI when I reformatted and got rid of RAID drives!

Changing to "AHCI" "As SATA Type" as shown in image in second post, causes Windows 7 x64 to lose / not see the GPT on my drive D: and it wants to "initialize" it as MBR or GPT-- no way!!


My System SpecsSystem Spec
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23 Nov 2014   #2
rancur3p1c

Windows 7 Business x64
 
 

ok, returning to BIOS and setting back to RAID, as AHCI type
  • enabled me to view the drive D: again
  • C: drive seems to be running much more slowly again.
these drives are plugged into the OnChip SATA
  • With AHCI as SATA type
    • no drive D:
  • With RAID as SATA type
    • have drive D:
    • but C: definitely dog-tired-slow

I really should not have fiddled with this at 3AM on a Sunday morning!!! Bah, I'm a pro, what could go wrong???

I'm not sure why changing to AHCI causes windows to miss the GPT on the D: drive.
Can I back this GPT up and restore it? Detect it after changing to AHCI? this is my only large drive, I can't back up the entire fricking thing.

The other question this makes me ask is how do I keep my GPT when I move to another motherboard? I don't trust the GPT like I do MBR hm....

edit: changing back again, it does not seem any faster. Doing more reading, it's ok to leave it as RAID because AHCI functions are still available no? So I really shouldn't gain/lose any performance?


Attached Thumbnails
cloned C:, installed AHCI drivers, changed BIOS to AHCI, D:'s GPT gone-img_0097.jpg  
My System SpecsSystem Spec
23 Nov 2014   #3
AddRAM

Windows 7 Pro x64 Windows 10 Pro x64
 
 

You just can`t change from Raid, IDE etc to AHCI once windows has been installed.

Forget the clone, re install windows clean with AHCI enabled first in the bios.

But someone recently made a thread about changing, not sure where it is.
My System SpecsSystem Spec
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25 Nov 2014   #5
rancur3p1c

Windows 7 Business x64
 
 

Quote   Quote: Originally Posted by AddRAM View Post
You just can`t change from Raid, IDE etc to AHCI once windows has been installed.

Forget the clone, re install windows clean with AHCI enabled first in the bios.

But someone recently made a thread about changing, not sure where it is.
I don't see why not????

That other thread is actually what lead me to these forums and is what I did.

I think the defragging program I used last really fubar'd my system.
OODefrag seems to have improved (restored) it a lot and everything seems back to normal now. Also, I need more RAM.

I'm worried about GPT now though, if my C: crashed or I fresh installed on an SSD, would I lose access to all my files? If switching from RAID to AHCI mode is what caused it, what if future PC does not have RAID config? Whatever it is that's preventing it from working in AHCI mode now, I am sure to run into in the future...
My System SpecsSystem Spec
25 Nov 2014   #6
gregrocker

 

Did you make the changes in AHCI : Enable in Windows 7 / Vista - Windows 7 Forums ? Why did you ignore that and only reply to the person who said you can't do what I provided you a link for?

Your files should be backed up at all times: Backup User and System Files
My System SpecsSystem Spec
25 Nov 2014   #7
rancur3p1c

Windows 7 Business x64
 
 

Quote   Quote: Originally Posted by gregrocker View Post
Did you make the changes in AHCI : Enable in Windows 7 / Vista - Windows 7 Forums ? Why did you ignore that and only reply to the person who said you can't do what I provided you a link for?

Your files should be backed up at all times: Backup User and System Files
Quote   Quote: Originally Posted by rancur3p1c View Post
That other thread is actually what lead me to these forums and is what I did.
I didn't ignore it, I answered it. I already made those changes
My System SpecsSystem Spec
27 Nov 2014   #8
rancur3p1c

Windows 7 Business x64
 
 

if anyone has ideas on how/why GPT does this and how to prevent it? RAM comes in tomorrow for new mobo and CPU
My System SpecsSystem Spec
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 cloned C:, installed AHCI drivers, changed BIOS to AHCI, D:'s GPT gone




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