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Arthur H. Edwards
*nix forums beginner
Joined: 11 Oct 2005
Posts: 31
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 Posted: Thu Jul 20, 2006 9:00 pm Post subject:
Re: CD writer wear out? RESOLVED
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Thanks to all who responded. I haven't tried the isopropyl
alcohol yet, but reducing the write speed to 16x has suddenly
made the writer much happier.
Art Edwards
On Tue, Jul 18, 2006 at 09:10:43PM -0500, Owen Heisler wrote:
| Quote: | On Tue, 2006-07-18 at 14:45 -0700, Cameron L. Spitzer wrote:
I make a lot of Knoppix disks because the Green Party here
gives them away. I get CD drives used or salvage or surplus,
all kinds and ages. Over time I collected nine drives that
stopped working: some wrote bad disks, others got read errors.
Took the cases off and cleaned the lenses carefully with
aqueous isopropyl "rubbing" alcohol on cotton swabs.
Eight of the nine work perfectly now. Try it.
The key is to remove the extra alcohol before it dries and
leaves a residue. Use a wet swab and then a dry one.
Interesting. Now I know why I have been keeping those CD burners that
work only half the time.
Note, even a perfectly good brand new CD-RW drive will write
bad CDs if you burn at full speed. The maximum writing speed
on modern CD blanks is very optimistic. Try burning at half
the automatically detected speed, or 16x, whichever is slower.
You will get a much higher yield. Your disks will be readable
in marginal drives that can not read disks burned at full speed.
Before I learned this, I had some very annoying experiences with CDs!
Also, don't waste your time with CD-RW media. I have tried
several brands and none erases well. Second burn yield is
under 50%. Third burn is near zero.
Just for the record, I have never bought CD-RWs, but I have collected a
few (about 20) used ones. The ones I have can be written at max 4x
speed, which is annoying. However, I have had very little trouble with
them.
I agree that they should not be used for any critical data. I use them
only for testing/temporary burning. Isn't it called "stuck bits" that
CD-RWs have after several burns?
Oh, and supposedly CD-RWs will last much longer than regular CDs. Light
causes the dye in regular CDs to deteriate, but that takes much longer
with the dyes in CD-RWs. (Okay, now everyone can pick that apart...
I've just "heard that" from someone.)
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iforone
*nix forums Guru
Joined: 28 Dec 2005
Posts: 330
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| Posted: Fri Jul 21, 2006 2:30 pm Post subject:
Re: newbie question -- Using Bootlog, Startup Messages, Console
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Gabriel Parrondo wrote:
| Quote: | El jue, 20-07-2006 a las 22:09 -0400, Miles Fidelman escribió:
and it turns out that it sure looks like the messages I'm trying to
capture are generated too early in the startup process to hit the log
files - guess I have to connect my laptop to the serial port and
capture the console traffic
If all you need is watch at the messages at boot-time, then you could
press the "Scroll Lock" key, which will "pause" the boot process and
give you some time to read, then you can scroll with Shift+PageUp or
Shift+PageDown. When you're done you press "Scroll Lock" again and the
process goes on.
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[ Altered the Subject Line to better reflect the Topic ]
Excellent! ;-)
I knew about the Shift+PageUp/Down, but had forgotten about the Scroll lock
key...
Kind Regards
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