Re: How to verify newly burned disc
Hi,
i wrote:
> ... > You would need a filter program which takes care not to read more
> ... > than ~ 20 MB/s.
Michael Lange wrote:
> I tried that, but as it seems without any effect on the drive's speed.
> Maybe my efforts were not sufficient :)
Did you test it with a superfast input like /dev/zero ?
time dd if=/dev/zero bs=1M count=1024 | your_filter >/dev/null
Does it curb that stream and need the due time ?
> It looks like when reading a DVD-RW it takes about 1.2 seconds
> to read 10 MB of data; when I insert the Asus-CD, the drive spins
> audibly faster, but surprisingly takes about 3 seconds to read 10 MB.
A rough estimation yields a linear density increase from CD to DVD by
a factor of 2.5 (= sqrt(4480MB/700MB)). Multiplied by 1.2 this yields
roughly 3, but does not explain the extra noise.
You would need to read larger parts of the media to get an estimation
of noise/speed ratio.
> > Does yours pull in the tray automatically after 200 seconds of standing
> > out ?
> Yes, it actually does.
At least it is not a random feature of individual drives.
> > I made a little poll here about this behavior, 1.5 years ago:
> I remember that :)
> Actually I thought I had participated, but that appears to be a false
> memory.
It's my memory which goes dim. I have you on the result list with
Reporter Drive Since Media Pulls
...
Michael Lange Plextor PX-810SA 2007 DVD no
Michael Lange TSSTcorp SH-224DB 2013 DVD no
...
I now added you with a 2021 ASUS DRW-24D5MT which pulls.
> > I wonder whether this is related to this obscure description
> > "E-Green technology auto-closes drive application when not in use,
> > saving over 50% power consumption for users"
> I thought they just mean that it spins down after a few minutes, but who
> knows?
The drives themselves have internal power management with timers for
partially shutting down the drive. The states are named "Active", "Idle",
and "Standby". The timer thresholds can be set by the computer. Further
the states can be ordered immediately by the computer.
> On the disc that came with the drive there is a "ASUS
> E-Green.exe", so maybe we would need to install this first to fully enjoy
> the Wonders of "E-Green"? :)
https://www.techwalla.com/articles/what-is-the-asus-e-green-utility
could mean that the .exe agressively strives for "Standby" by setting low
timer thresholds. It seems also to be capable to count the time in that
state and to brag with its power savings.
If my /dev/sr0 is annoyingly excited after Linux block i/o i run
xorriso -outdev /dev/sr0
which ends by a drive calming START/STOP UNIT command.
------------------------------------------------------------------
Another thing which makes me wonder about ASUS' description of the drive
is where they expect us to still find M-Disc DVD+R media. Last time i
looked i found only M-Disc BD-R (and some "currenlty unavailable" DVD
offers).
Have a nice day :)
Thomas
Reply to: