Does M4N78 PRO support 3TB disks?


  1. Scratchy
    Posts : 23
    Windows 7 Ultimate x64
       New #1

    Does M4N78 PRO support 3TB disks?


    I'm gonna buy a new HDD and wonder if my setup support a 3TB SATA disk?

    [Caviar Green / 64MB / 3TB]

    I have M4N78 PRO, Win7 64bit and AHCI.
    Last edited by Scratchy; 19 Dec 2011 at 15:01.
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  3. bassfisher6522
    Posts : 2,240
    Windows 7 Ultimate 64 bit
       New #2

    I have the same board and I'm not quite sure either. Not sure if there is a limitation on how many hdd's and what size. I don't see anything is the manual that's online from Asus.

    ASUSTeK Computer Inc. - Motherboards- ASUS M4N78 PRO
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  4. Scratchy
    Posts : 23
    Windows 7 Ultimate x64
    Thread Starter
       New #3

    Ok, I have 4 hdd's and one DVD drive. Only one SATA left.

    Answer from Asus
    This motherboard has a total of six SATA 3GB/s ports.

    Due to Microsoft limitation, the MBR (Main Boot Record) partition table is the default option for initializing hard disks. However, the MBR partition table can only manage up to a 2TB partition. So you can use a 3TB disk but you probably wont be able to use the HDDs whole capacity.
    Last edited by Scratchy; 20 Dec 2011 at 16:38.
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  6. bassfisher6522
    Posts : 2,240
    Windows 7 Ultimate 64 bit
       New #4

    Well there you go....good catch. I looked right over it. Now, for my board, it's the older version of the new one....in order to use the other two sata ports I have to use either AHCI or RAID. So far I have no need to add anything yet...lol.
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  7. jimbo45
    Posts : 5,941
    Linux CENTOS 7 / various Windows OS'es and servers
       New #5

    Scratchy said:
    Ok, I have 4 hdd's and one DVD drive. Only one SATA left.

    Answer from Asus
    This motherboard has a total of six SATA 3GB/s ports.

    Due to Microsoft limitation, the MBR (Main Boot Record) partition table is the default option for initializing hard disks. However, the MBR partition table can only manage up to a 2TB partition. So you can use a 3TB disk but you probably wont be able to use the HDDs whole capacity.
    Hi there

    If you change the disk from MBR to GPT you can have up to 18 EB (yes EB if you can find a disk large enough !!).

    Tutorial here from this very forum.

    Shame some of the "Tech advice" given to you by Asus seems woefully inadequate or not complete -- true that an MBR disk can have max 2TB partition but they should have told you OTHER possibilities too.

    Convert MBR Disk to GPT Disk

    cheers
    jimbo
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  8. Scratchy
    Posts : 23
    Windows 7 Ultimate x64
    Thread Starter
       New #6

    Thanks!

    18 EB isn't that bad :) Then I don't have to worry about a 3TB disk :)
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  10. Scratchy
    Posts : 23
    Windows 7 Ultimate x64
    Thread Starter
       New #7

    I bought a Western Green 3TB but I only see 801,6GB in BIOS and 746,39GB in Windows

    Update 1: BIOS updated. Doesn't help!
    Update 2: Changed from AHCI to SATA mode in BIOS. It worked :)

    Now I'm formatting the drive. It takes some time. When it has finished I'll try change to AHCI again and hopefully everything works fine then :)

    At the moment I can't use one hdd and my dvd drive. It's because they are in the two black sata ports which only works with AHCI.

    Update 3: The computer freeze when formatting. Then I restart but the pc just freezes. I can't enter win anymore.

    Update 4: Removed the new drive and everythings fine! Wonder if it got broken?
    Last edited by Scratchy; 04 Jan 2012 at 19:30.
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