Re: How to verify newly burned disc
Hi,
On Fri, 02 Jul 2021 21:22:00 +0200
"Thomas Schmitt" <scdbackup@gmx.net> wrote:
> 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 ?
I did now, and it does (it took about 1 min. to read approx. 300 MB;
without "pulling the brakes" it took about 1 sec.). Since I am no good
with shell scripting I did not use dd though, but a simple Python function
that I think does basically the same; the way I used to slow it down is
quite primitive however (basically it just waits until 10 MB have been
read and then sleeps for 2 sec.), which may be too simple to stop the
drive from happily spinning on.
>
> > 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.
I see, so CDs are generally slower than DVDs, and (no surprise) the
DVD-RW is a bit slower here than a "real" (bought) DVD.
>
>
> > > 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.
Nice! This work here, too. :-)
>
> ------------------------------------------------------------------
>
> 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).
Well, looks like this is not so hard.
The first hit at ebay.de when searching for "m-disc dvd" shows an offer
for 10 4.7 GB discs at 85.11 € + 7.31 € for shipping from Japan :-)
They're Verbatim discs though, might be they break in the process :D
There is also an offer from Australia, 5 discs for "~" 21.74 € + ~ 42.97
shipping (also Verbatim :) and a little bit further down the "killer"
bargain: 10 Verbatims for ~ 46.11 € + free shipping! Buy now!! :-)
Best regards
Michael
.-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-.
If some day we are defeated, well, war has its fortunes, good and bad.
-- Commander Kor, "Errand of Mercy", stardate 3201.7
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