RAID enabled; Want to switch to ACHI

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  1. acurasd
    Posts : 972
    Windows 7 Ultimate x64
       New #1

    RAID enabled; Want to switch to ACHI


    I have my dad's computer already setup with Windows 7.

    For some odd reason being that there is only one drive in the computer. the computer's bios is set to RAID. I know you need at least two drives to perform any RAID functions.

    When I tried to switch over the SATA drives in the BIOS from RAID to ACHI, windows failed to start.

    Is there some proceedure first that I need to do before I switch them? Like a driver or does the hard drives have to be switched on a clean install of windows?
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  3. Product FRED
    Posts : 1,083
    Windows 7 Enterprise 64-bit
       New #2

    You should really perform a clean install. When your dad set up RAID, he needed to set up RAID drivers during Windows installation. It would be wise to just reinstall without the RAID drivers to keep everything stable instead of switching at this point.
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  4. theog
    Posts : 11,408
    ME/XP/Vista/Win7
       New #3

    You could take a look:

    AHCI : Enable in Windows 7 / Vista
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  6. acurasd
    Posts : 972
    Windows 7 Ultimate x64
    Thread Starter
       New #4

    yeah that is what i figured. I was the one that set the computer up but it was a computer bought from HP and that is the way it was set up by default.

    Do the companies know what they are doing when they do this or they just send them on their way hoping no one will figure it out?

    If your going to do raid... the only way is raid 5.

    If it is just one hard drive..what is the point?
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  7. gregrocker
    Posts : 50,642
       New #5

    Are you sure you have only one HD?

    RAID often shows only one HD in Computer which the array creates.

    Check Device Manager to see what driver is actually installed.

    You sound like you're experienced enough to know, but most users will just see the one HD listed in Computer and not notice it is array.
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  8. WindowsStar
    Posts : 2,737
    Windows 7 Enterprise (x64); Windows Server 2008 R2 (x64)
       New #6

    acurasd said:
    I have my dad's computer already setup with Windows 7.

    For some odd reason being that there is only one drive in the computer. the computer's bios is set to RAID. I know you need at least two drives to perform any RAID functions.

    When I tried to switch over the SATA drives in the BIOS from RAID to ACHI, windows failed to start.

    Is there some proceedure first that I need to do before I switch them? Like a driver or does the hard drives have to be switched on a clean install of windows?
    Most computers are shipped with RAID turned on by default even if you have one (1) hard drive. It will not affect performance and there is no need to change to ACHI. Plus it makes it easy if you want to add another hard drive and use RAID 0 or RAID 1.
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  10. bobkn
    Posts : 2,606
    Windows 7 Pro X64 SP1
       New #7

    [/QUOTE]Most computers are shipped with RAID turned on by default even if you have one (1) hard drive. It will not affect performance and there is no need to change to ACHI. Plus it makes it easy if you want to add another hard drive and use RAID 0 or RAID 1.[/QUOTE]

    Are you quite sure about this? It sounds wrong to me.

    I admit that I haven't bought a commercial PC since 1995. I've used Dell PCs at a few employers, but all of them were configured by corporate IT.

    I'm moderately sure that my current system (X58 chipset, ICH10R controller) not permit a pre-RAID setup with a single disk. I haven't done Intel raid for a while; has a RAID 10 setup, but it appeared to add more annoyance than performance.
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  11. WindowsStar
    Posts : 2,737
    Windows 7 Enterprise (x64); Windows Server 2008 R2 (x64)
       New #8

    Most computers are shipped with RAID turned on by default even if you have one (1) hard drive. It will not affect performance and there is no need to change to ACHI. Plus it makes it easy if you want to add another hard drive and use RAID 0 or RAID 1

    Are you quite sure about this? It sounds wrong to me.

    I admit that I haven't bought a commercial PC since 1995. I've used Dell PCs at a few employers, but all of them were configured by corporate IT.

    I'm moderately sure that my current system (X58 chipset, ICH10R controller) not permit a pre-RAID setup with a single disk. I haven't done Intel raid for a while; has a RAID 10 setup, but it appeared to add more annoyance than performance.
    Yep, the last Dell and HP machines we have purchased over the last 6 month all have RAID turned on by default from the factory with only one hard drive.
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  12. WindowsStar
    Posts : 2,737
    Windows 7 Enterprise (x64); Windows Server 2008 R2 (x64)
       New #9


    I admit that I haven't bought a commercial PC since 1995. I've used Dell PCs at a few employers, but all of them were configured by corporate IT.
    Corporate IT will make changes as they see fit. They may turn it off for recovery needs, special boot ups, etc.
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  13. stormy13
    Posts : 6,879
    Win 7 Ultimate x64
       New #10

    acurasd said:
    Do the companies know what they are doing when they do this or they just send them on their way hoping no one will figure it out?
    Ask those with HP AMD based computers running XP about what happened when SP3 came out.
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