[G4] FW: G4 Disk Capacity Limit - Real or Logical?

[J.M.P.Hissel]

 Diane, as said in my message before:

----------
> Van: Peter <peterh5322 at rattlebrain.com>
> Beantwoord: g3-5-list at googlegroups.com
> Datum: Sat, 23 Aug 2008 20:45:41 -0700
> Aan: g3-5-list at googlegroups.com
> Onderwerp: Re: G4 Disk Capacity Limit - Real or Logical?
> 
> 
> 
> On Aug 23, 2008, at 7:46 PM, Kris Tilford wrote:
> 
>>> These older ATA controllers have a 137GB limit - any drive larger
>>> would only be usable to that limit.
>> 
>> You can overcome this limit in two ways:
>> 
>> 1)Using the ATA Hi-capacity extension from Intech for OS X, and if you
>> use OS 9 you can format the HD using Speedtools 3.5 for OS 9.
>> 
>> 2)There is a firmware hack that enables larger HD to work.
>> 
>> Both will enable large HDs.
> 
> The Hi-Cap kext will not work with Leopard, at least not the version
> I have.
> 
> Otherwise, the limitation is precisely 131,072 MB (128 GB), not 137 GB.
> 
> The "hardware hack", as the writer put it, is simply enabling
> properties which were already present in the machine's ROM.
> 
> As long as you DO NOT do a reset-nvram O.F. command, the properties
> will remain enabled forever.
> 
> I have had one of my Digital Audios with these properties enabled for
> months ... without the Hi-Cap kext ... and have had no issues
> whatsoever.
> 
> There are three different version of essentially the same thing:
> Enable LBA48.
> 
> One works for the ATA-4 channel, one works for the ATA-3 channel and
> one works for the ATA-2 channel.
> 
> You have to know which one is appropriate for your machine, and you
> DO have the ability to enable the properties for the HD bus, the
> optical bus, both or neither.
> 
> (For 133 MHz bus machines, such as a DAs or QSes, ATA-4 and ATA-3 are
> the correct selections, but these properties are automatically
> enabled in the QS 2002 and all later machines).
> 
> As has been previously stated, LBA48 is an ATA protocol function, not
> a real limitation.
> 
> 
> ATA-4 commands:
> 
> #! /bin/bash -
> 
> if kextstat -lb com.apple.driver.KeyLargoATA | grep -F -q KeyLargoATA &&
> ! ioreg -rStp IODeviceTree -n ata-4 -w0 | grep -F -q lba-48
> then read -rd $'\000' nvram nvramrc <<< "`nvram nvramrc 2>&-`"
> if sudo nvram 'use-nvramrc?=true' \
> nvramrc='dev mac-io/ata-4 0 0 " lba-48" property device-end'" $nvramrc"
> then echo '48-bit LBA support will be enabled on the next reboot.'; fi
> fi
> 
> 
> ATA-3 commands:
> 
> #! /bin/bash -
> 
> if kextstat -lb com.apple.driver.KeyLargoATA | grep -F -q KeyLargoATA &&
> ! ioreg -rStp IODeviceTree -n ata-3 -w0 | grep -F -q lba-48
> then read -rd $'\000' nvram nvramrc <<< "`nvram nvramrc 2>&-`"
> if sudo nvram 'use-nvramrc?=true' \
> nvramrc='dev mac-io/ata-3 0 0 " lba-48" property device-end'" $nvramrc"
> then echo '48-bit LBA support will be enabled on the next reboot.'; fi
> fi
> 
> 
> ATA-2 commands:
> 
> #! /bin/bash -
> 
> if kextstat -lb com.apple.driver.KeyLargoATA | grep -F -q KeyLargoATA &&
> ! ioreg -rStp IODeviceTree -n ata-2 -w0 | grep -F -q lba-48
> then read -rd $'\000' nvram nvramrc <<< "`nvram nvramrc 2>&-`"
> if sudo nvram 'use-nvramrc?=true' \
> nvramrc='dev mac-io/ata-2 0 0 " lba-48" property device-end'" $nvramrc"
> then echo '48-bit LBA support will be enabled on the next reboot.'; fi
> fi
> 
> 
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