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SATA HDDs Acting as IDE HDDs ??

post #1 of 10
Thread Starter 
While copying files from my SATA HD to my new Revodrive X2, the transfer rate was about 50mb/sec, which struck me as rather slow. I checked the BIOS settings, and it appears that both SATA HDDs are operating in IDE mode. I changed the SATA controller to AHCI and rebooted but it didn't work (system not found or some such).

Are my SATA drives correctly installed, or do I have to start again ? All my backup data software etc is on these two drives - do I have to wipe them to change their mode of operation, or reinstall windows only ?

PS the Revodrive is awesome :-)
post #2 of 10
Quote:
Originally Posted by blewyn View Post
While copying files from my SATA HD to my new Revodrive X2, the transfer rate was about 50mb/sec, which struck me as rather slow. I checked the BIOS settings, and it appears that both SATA HDDs are operating in IDE mode. I changed the SATA controller to AHCI and rebooted but it didn't work (system not found or some such).

Are my SATA drives correctly installed, or do I have to start again ? All my backup data software etc is on these two drives - do I have to wipe them to change their mode of operation, or reinstall windows only ?

PS the Revodrive is awesome :-)
If the OS was installed on the SATA HD, and you changed it to AHCI, then you need to reinstall the OS. You should be able to boot back up if you change it to IDE again.


EDIT: If you change it to IDE, and it won't boot up, grab an ubuntu live disk and you should be able to copy the files over to the revo drive that way.
Edited by JacobKay97 - 3/6/11 at 5:18am
    
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post #3 of 10
You absolutely don't need to reinstall to change from IDE to AHCI mode in the BIOS. All you need to do is 'prepare' the OS before making the BIOS change. When you change from IDE to AHCI Windows will not boot because it has the wrong driver in place, if you make sure it loads the correct driver then it will boot up and you can make the change fine.

Check out this article for how to do it, you can either change the registry by hand or download a .reg file that will do the work for you. Basically you boot up with the BIOS set to IDE mode, change a registry value so Windows is ready to load the AHCI driver instead, reboot, change the BIOS from IDE to AHCI, then boot into windows. Done and sorted!
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post #4 of 10
Thread Starter 
My OS is installed on the Revodrive, which is on PCI-E. The two SATA drives are now for storage only. If I change them from IDE to AHCI, will I see a performance increase ? I'm a bit perplexed as to why a file copy from one HDD to the SDD (Revodrive) should happen at 50mb/sec only....
post #5 of 10
You probably won't actually notice a visible day to day performance increase unless you are copying a lot of stuff around the place. When you see 50MB/s from the HDD to the SDD are you copying a lot of different sized files? If you are copying one large contiguous file I'd expect to see faster transfer speeds but if it's a bunch of smaller files it may well be quite a bit slower, as it hitches up between each different file location. That's random read speeds which are a lot slower than sequential. If it's a large sequential speed then perhaps there is something wrong...?

I would probably go ahead and change over the AHCI first and see where that gets you.
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post #6 of 10
Thread Starter 
I just copied a 7GB file from the SDD to the HDD - speed was 75mb/sec. Copying from SDD to SDD was 250mb/sec, and copying from HDD to SDD was also 75mb/sec.

Aren't these speeds a bit slow ?
post #7 of 10
IDE mode means its working as a regular single hd (no performance loss)

AHCI enables the onboard caching and hot swapping, but you have to have it enabled before installing windows or do a manual registry change


Raid is letting the bios know you're using raid on some of the drives



Thats how my Asus bios is setup at least
post #8 of 10
Quote:
Originally Posted by blewyn View Post
I just copied a 7GB file from the SDD to the HDD - speed was 75mb/sec. Copying from SDD to SDD was 250mb/sec, and copying from HDD to SDD was also 75mb/sec.

Aren't these speeds a bit slow ?
Which of these is slow? They sound about normal.
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post #9 of 10
75-150 mb/s for mechanical hd's are good speeds
post #10 of 10
Thread Starter 
Ah, OK.

Thanks !
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