On Mon, 29 Nov 1999, Brian Anderson wrote:
> Hardware compression... How can I tell if it's enabled / disabled /
> working correctly.
>
> I got a tape drive from a friend. It is listed as being a 12/24 gig DAT. I
> am currently only getting 12 gig of data on it. Currently I'm backing up
> with a simple tar script...
>
> I know very little about tape drives (any good FAQ would be welcome). I'm
> assuming that the data type is still relevant, even with hardware
> compression? (an mpeg file won't compress as much as a text file...)
You might get 2 to 3 percent compression of a mpg if it is a very efficient
algorithm. Forget anothing over that. Don't bother to compress compressed
data again.
> Essentially, I'm looking at backing up a lot of highly compressed data. My
> assumption is that I can expect that I really won't get that dreamt of 2:1
> ratio on the tape label... I'd just like to get confirmation on that.
12G is a LOT for one tape....
> Assuming my data is compressed to begin with, I'm only going to get 12 gig
> on this, right?
Yes.
> Did that make sense?
Yes.
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