Re: Apply Apple updates only after Safe Boot?

In article <lightoflife-C54E0C.17461417092008@xxxxxxxxxxxxxxxxx>,
Mike <lightoflife@xxxxxxxxxx> wrote:

I've seen varying advice about the advisability of applying system
updates only after the following steps:

1.Repair permissions/run disk utility to check for disk errors
2.Boot into safe mode
3.Apply the update only after downloading the updater file from software
update,that is, by not allowing software update to perform automatically.
4.Allowing the machine to reboot as the installer directs.
5.Reboot into safe mode again,login,repair permissions.
6.Reboot normally and go on your merry way.

I've tried this way and by just letting software update run and have
only had a couple of (minor) problems over the years no matter what
method I used. The issues were solved both times by reapplying via
standalone combo update. No big thing either time, just oddities I can't
even recall now.

Uh,rule #1 should be BACK UP BEFORE ANY MAJOR SYSTEM CHANGE - but then
backups should be SOP under any circumstance.

What are thoughts here?

I think the biggest problem with software updates is existing hard drive
corruption. Early symptoms like application preferences not saving
might not be be noticed. Replace 200MB worth of the operating system on
a corrupted hard drive and the system gets scrambled.

Repairing file permissions does not repair corruption. You have to run
"fsck -fy" with the filesystem in read-only mode or run Disk Utility
from a boot CD. I've noticed that boot drive corruption is increasingly
rare but it still happens.

10.4 users should apply updates in "Safe Mode" because of the
"update_prebinding" bug. If any application references a newly
installed system library during the "Optimizing System" phase, that
library can be destroyed. The 10.5 installer works around prebinding
bugs automatically.

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