On Jul 6, 2009, at 7:33 PM, Michael Koch wrote:
> What is the "High Cap" LBA48 and how does it work.
The LBA48 properties is a set of commands which are added, as
appropriate, to your Open Firmware NVRAM.
You will need to select the appropriate pair of LBA48 properties, one
for the HD bus and one for the optical bus.
The one for the optical bus is certainly optional, but as I generally
use the Zip position for initializing and cloning new drives, it may
make some sense to do both.
For the Digital Audio and for the Quicksilver 2001 models, the
correct properties are found in the enable-lba48-ata4 and the enable-
lba48-ata3 files.
Earlier models may take other combinations, with the caveat that the
HD bus is always the fastest and, consequently, it always has the
higher ATA number.
The files are as follows:
enable-lba48-ata4 ...
#! /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
enable-lba48-ata3 ...
#! /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
enable-lba48-ata2 ...
#! /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
These are "persistent" until you issue the "reset-nvram" O.F.
command, which may be never.
In the case of the 4 and 3 properties, this makes your Digital Audio
or Quicksilver almost exactly alike a Quicksilver 2002.
The END!
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