Whisky-dave
way only changed. The DATA IS NOT lost in the real world.

nospam
data is definitely lost in the real world.

Whisky-dave
How ?

Explain the process.

nospam
it's very simple. someone tries to access a document and it fails for

any of a number of reasons, including hard drive failure.

Whisky-dave
Well I thought you were refering to SSD or flash media in phones or computers

nospam
doesn't matter.

Whisky-dave
But you don;t get head crashes with SSDs,

and with optical media there's a chance of scratches that can come via the read/write heads or just though dropping and getting physical damage.

And you claimed data couldn't be lost if you had a backup, but that's another point.

nospam
if you have a backup, you can't lose anything unless every backup fails at the same time which is *extremely* unlikely.

Whisky-dave
How would you know you needed to acess the backup ?

Peole only normally access backups in order to restore stuff. If you haven;t lost anyhting why bother.

So you have this 'simple' failure, what does that actually mean though. do you mean a 404 error on a web browser, or a file can't be found or a file can't be open, or a corrupt file.

nospam
doesn't matter.

Whisky-dave
yes it does. If a file can't be found does that mean it's moved or deleted.

I know when you 'move' a file on a Mac it doesn;t actually move anywhere, it might lok as though it's moved but it hasn;t in the real world it still occupies exactly the same area of disc as it did, the files data hasn't moved.

Even when you delete a file all that happens is that data is changed no data is lost useful information might derived from the file.

The same amount of data exists on a black HD SSD etc as one that is full. The number of sectors and blocks remain the same once formated.