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AHCI vs IDE (SSD and HD)

post #1 of 15
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I got and SSD and looks like for better performance I have to switch to AHCI which is pretty simple. The thing is that I'll be using SSD for system and some files and mechanical drives for storage. I am learning my way through SSD's

1) Do I switch AHCI only for SSD, and at the same time HD will still wotk on IDE?

2) Is there any problem I can have with AHCI vs IDE at the same time? such as Fat32 and NTFS or it dosent really matter. So if I will go with AHCI I still will be able to access IDE

3) I have HD where I store all my data which is IDE, so if I change to AHCI will I lose that info?


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post #2 of 15
For me at least i can only seem to change my sata ports in groups
ex ports 1-3 can be either ide or ahci
or ports 4+6 either ide or achi
I know if your hd is running in ide mode and you switch it to ahci it won't boot (personal experience)
Can you change over groups of ports say change ports 4+5 to ahci then use the ssd on one of them and leave the other ports ide where you have your current drive connected.??
hope that helped....
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post #3 of 15
Your MB probably has more than one SATA controller, mine has three. Two of my controllers can be set to AHCI or IDE and one is IDE only. Look in your MB manual and see what options you have. If you have more than one SATA controller plug the SSD into one and set it to AHCI, plug your mech HD into the other one and set it to IDE.

If you actually only have one SATA controller then set it to AHCI and the mech HD will work just fine.

Any data on the mech HD will not be lost as long as you do not format or erase the mech HD.

If you are new to SSD's then you may want to review this thread.

http://www.overclock.net/ssd/929553-win-7-ssds-setup-secrets.html
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post #4 of 15
AHCI vs IDE is mostly just an issue with the OS drive - something to do with drivers. Heck, for all I know, it might be something that only affects Windows. I've never really tried switching SATA modes in Linux.

For data drives you can switch between AHCI and IDE as much as you want and it wouldn't matter. If possible, I do recommend running in AHCI mode so you get NCQ.
Edited by rui-no-onna - 3/11/11 at 9:39am
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post #5 of 15
Here's the deal....

1.) AMD and Intel chipsets are completely different and the AMD stuff doesn't seem to play well with AHCI and MAY slow lower speeds.

2.) AHCI benefits SSDs much more than mechanical HDs.

3.) The ability to separate ports between AHCI and non-AHCI is ONLY an AMD thing.

4.) AMD chipsets are slower than Intel's.

5.) For the last 2 years AMD's chipsets have been slower than Intel's offerings and if you want the best AMD is NOT in the race.
Edited by Old Hippie - 3/12/11 at 10:36am
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post #6 of 15
Quote:
Originally Posted by Mr. Original;12684952 
I know if your hd is running in ide mode and you switch it to ahci it won't boot (personal experience)
....

You can do it if you enable the AHCI driver in the registry, before you change the SATA mode of the boot drive.
To do this, follow these steps:
Exit all Windows-based programs.

Click Start, type regedit in the Start Search box, and then press ENTER.

If you receive the User Account Control dialog box, click Continue.

Locate and then click one of the following registry subkeys:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Msahci

In the right pane, right-click Start in the Name column, and then click Modify.

In the Value data box, type 0, and then click OK.

On the File menu, click Exit to close Registry Editor.

Then change to AHCI in the bios and boot smile.gif
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post #7 of 15
Quote:
Originally Posted by ACHILEE5;12705758 
You can do it if you enable the AHCI driver in the registry, before you change the SATA mode of the boot drive.
To do this, follow these steps:
Exit all Windows-based programs.

Click Start, type regedit in the Start Search box, and then press ENTER.

If you receive the User Account Control dialog box, click Continue.

Locate and then click one of the following registry subkeys:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Msahci

In the right pane, right-click Start in the Name column, and then click Modify.

In the Value data box, type 0, and then click OK.

On the File menu, click Exit to close Registry Editor.

Then change to AHCI in the bios and boot smile.gif

Nice tip:thumb:
Now, tell me pls, for mech HD, 2xF3@R0, what do you recommend AHCI or IDE
Thanks for your expertise:D
post #8 of 15
Quote:
Originally Posted by Nuno MG;12732927 
Nice tip:thumb:
Now, tell me pls, for mech HD, 2xF3@R0, what do you recommend AHCI or IDE
Thanks for your expertise:D

So u've resolved the problem??
post #9 of 15
Quote:
Originally Posted by Nuno MG;12732927 
Nice tip:thumb:
Now, tell me pls, for mech HD, 2xF3@R0, what do you recommend AHCI or IDE
Thanks for your expertise:D
Is that software RAID-0? If it's hardware, then AHCI vs IDE isn't really an issue since the RAID controller makes the decisions. If you used Intel RAID, then that's automatically AHCI, I believe. AHCI does benefit HDD's. Perhaps not as much as SSD's but they do still benefit them. The only caveat it seems is if you're using an AMD chipset as Old Hippie has mentioned.
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post #10 of 15
Quote:
Originally Posted by rui-no-onna;12734048 
Is that software RAID-0? If it's hardware, then AHCI vs IDE isn't really an issue since the RAID controller makes the decisions. If you used Intel RAID, then that's automatically AHCI, I believe AHCI does benefit HDD's.. Perhaps not as much as SSD's but they do still benefit them. The only caveat it seems is if you're using an AMD chipset as Old Hippie has mentioned.

Yep smile.gif

And yeah HDDs like AHCI too, because of NCQ smil3dbd4e4c2e742.gif
300px-NCQ.svg.png
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