> I don't know how to reply with the forum; i have create an account, but i
> can't find how to do this.
>
> That's i don't understand is why an 320 GB cartridge contains only 190 GB.
>
But, it really is a 160GB native cartridge and anything more than that
is a bonus.  The 320GB is a guess based on if you have what the drive
manufacturer assumes as a typical set of data.

Remember that compression is data dependent so you will never get
exactly 320GB compressed on a 160GB native tape. Also remember that
you typically can not compress data more than 1 time so if any of your
files are compressed (.zip, .gz, .7z, .jpeg, .mp3, .mpeg ...) they
will not compress much if at all. So if you were backing up 160GB of
mpeg data expect that to fill an entire 160/320 tape. However if you
are only backing up text files you would easily fit 500GB of text on
that 160/320 tape.


Can you post the answers to the questions Fabio asked you?

John

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