ATA133 drive on ATA100 Controler
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Thread: ATA133 drive on ATA100 Controler

  1. #1
    Join Date
    Apr 2004
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    ATA133 drive on ATA100 Controler

    I am thinking about upgrading to a new motherboard, CPU ect. And I would like to move my current HDs onto the new system. I have three ATA133 Hard Drives all of which are 160GB or greater.

    The problem is that most of new motherboards that I am considering (Socket T/ LGA 775) only support ATA100. And from what I understand, "classic" ATA100 controlers use 24bit addressing which only support drives up to 137GB. ATA133 uses 48bit addressing and supports drives up to 131,072 terabytes.

    Now I know that large capacity ATA100 drives (>137GB) exist. I have also seen some info suggesting that newer controlers are "48bit LBA enabled".

    Does anyone has any more info on whether the newer ATA100 controlers on the newer boards will support my drives.
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  2. #2
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    I would be very surprised if any motherboard coming out presently didn't support 48bit LBA on the IDE controller, regardless of whether it's ATA100 or 133.
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  3. #3
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    Quote Originally Posted by wrathchild_67
    I would be very surprised if any motherboard coming out presently didn't support 48bit LBA on the IDE controller, regardless of whether it's ATA100 or 133.

    True, I can't think of any that don't support it.

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  4. #4
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    Yup, ATA100 does not have that limitation afaik and currently over 70% of my disks in use are over 200GB and alot of them are sitting on ATA100 controllers and alot of the drives are just ATA100 drives anyhow. Even older ATA100 boards (like the other day i put a 200GB Disk on an KT266A board) works fine with large Hdds, did'nt have to do anything like turn on 48 bit LBA etc..
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  5. #5
    Join Date
    Apr 2004
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    Thanks guys, I am also inclined to think that current MOBOs support 48bit LBA on ATA100 controlers. Its just that I had some trouble about 4-5 years ago, when I installed my 1st ATA133 160GB on an Abit KT7 and the MOBO's ATA100 controler would only recognized the drive as a 130GB. After some Googling, I found out that the original ATA100 protocol developed by Quantum used 24bit addressing. I ended up getting a Promise ATA133 controller card to fully utilize the HDs full capacity.
    Main Rig: Q6600@3.6ghz for now | GA-EP35-DS3P | Radeon X1600PRO 256MB | G.SKILL PC2-6400 (2 x 2GB) | 550W FSP PSU
    HTPC: Opteron 165@2600 | DFI nF4 Ultra-D | Radeon HD 3450 512MB| | G.SKILL PC4000 (2 x 1GB) | ThermaltakeTR2-430W PSU
    HTPC2: ATHLON XP 2400+ | MSI KM266 KM2M | Radeon 9600 256MB | Diamond Xtreme Sound 7.1 | 512MB PC133
    Rig 2: Pentium 4 2A(Northwood) @2.67GHz | ASUS P4S533 | RADEON 9600 256MB | CRUCIAL PC-2700 (2x512GB) | 400W Allied PSU

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