"The Natural Philosopher" wrote in message
...
Andy Champ wrote:
On 10/05/2012 16:32, The Natural Philosopher wrote:

Exactly so. Those of us who have worked on te DESIGN of such systems
know that it is impossible to solve the problem *entirely in software*.

This turns out not to be the case.


It turns out to be exactly the case.

So explain why a file system that writes its intent to a file and then
updates the file and then records that in the log doesn't work.
Like how exactly it corrupts the file system let alone the disk which power
fails don't corrupt in the first place.
You might design a disk system that doesn't detect power fail and corrupt
itself but nobody else does.
You can turn hard drives off as often as you like and they do not fail to
detect the power failing or corrupt themselves.
Once you know this then it is easy to understand why power fails don't have
to corrupt the disk, or the file system or even a correctly designed
application.