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MacOS X 10.2 - 10.5.x Leopard

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SpeedTools ATA Hi-Capacity Driver 3.0 - Mac

Bust the 128 GB Barrier for ATA hard disks on G3 & G4 PowerMacs!

The ATA Hi-Cap Support Driver software was created to allow the use of extended capacity ATA drives (drives greater than 128 Gigabytes in size) on older (Pre-Mirrored Door) G4 and G3 Macintoshes -- including Cubes, PowerMacs, PowerBooks, iBooks, eMacs and iMacs running MacOS X versions 10.2 and later.

Without this software installed, any extended capacity drive which is connected to the built-in ATA bus on older Macintosh models will be limited to only 128 Gigabytes. Intel Macs, PowerPC G5 Macs and late model PowerPC G4's do not suffer from this limitation.

The ATA Hi-Cap driver package also includes an easy-to-use installation/removal utility.


  • Enables full capacity of ATA drives greater than 128 Gigabytes.
  • Fully Bootable - unlike some FireWire and USB devices.
  • Eliminates the need to buy a costly PCI ATA Card or FireWire enclosure
  • Compatible with most S.M.A.R.T. utilities - unlike FireWire and USB devices
  • Perfect for Macs which don't have a PCI slot (like Cubes, iMacs and eMacs)


Just a couple...

Common Questions:

We have been pleased by the great amount of interest that we've received about this product. Based upon the feedback we have been getting, there seems to be a few key questions which are regularly asked:

Will I be able to recover my Hi-Cap boot drive with a repair utility if I need to boot from an emergency CD/DVD?
If you plan to use this drive under BOTH MacOS X and true MacOS 9 (not the Classic shell), please download a copy of our SpeedTools ATA Hi-Cap Driver User's Guide file. There you will find a full explanation of possible issues involved and several recommendations for eliminating possible problems.

Will this driver fix capacity limitations with older FireWire cases or PCI ATA Cards?
Sorry, no. This driver ONLY fixes the 128GB limitation with drives connected to Apple's built-in ATA buses.

Is an ATA drive which is installed in a FireWire or USB case supported?
Sorry, no. This driver ONLY fixes the 128GB limitation with drives connected to Apple's built-in ATA buses.

Will I get the full speed of the drive?
Absolutely. There is no performance penalty for using this driver whatsoever.

The "Safe Partitioning" guidlines in the 'User's Guide' pdf file recommends I setup a 127.99 GB first partition and allocate the rest of the drive in a second partition. Can't I create a smaller (less than 127.99 GB) first partition to boot from and allocate the rest to a second partition?
Yes, this will work. But it is riskier: Intech does not consider any partition scheme which causes a single parition to span the 128 GB addressing "barrier" to be ideal. To understand why, consider what will happen if you have a volume which spans this barrier and for some reason the Intech Hi-Cap Support Driver does not load. The volume which spans the "barrier" will still mount and appear to function as normal. However, when a read or write request is made which is beyond this barrier, it will fail. This means you would likely never even be aware of the situation until you actually see such an error. In theory, whichever application program made the failed request should be able to elegantly handle a data transfer error, but you never know for sure. This is why we at Intech think any partition strategy other than the one we recommend is not the best choice.

System Requirements:

  • MacOS X (10.2 through 10.5.x)
  • Any Macintosh G3*
  • One or more ATA drives greater than 128 gigabytes in size

* Note: Installation on the 'Rev A.' Blue & White G3 Ultra-33 ATA bus is NOT supported! However, it is compatible with the Multiword DMA bus (CD/DVD bus). So, you can simply connect your hi-capacity drive to your CD/DVD bus and all will work well. For 'Rev B' Blue & White G3 owners, we have had several reports that our hi-capacity driver works great on the built-in Ultra-33 bus.

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