Can't read DVD

[g]

On 08/24/2013 08:06 AM, Martin S wrote:
<>

> Aye I know about non-factory discs but I thought 2 out of 10 or 12 was a bit
> excessive. I ran that command without errors (expected, the laptop is only a
> few months old) but I'll go look at them as you say =)

i do not know it there is a 'rule of thumb' for a defective cd/dvd, but i
imagine the mfg's have a lot of info on them.

i only know of what i have experienced.

as an over all;

new:

bad a cd/dvd shows up less.
defect is for entire stack,
sometimes it will be a low 10 to 20 percent. some times more/less.
bad show in inner tracks, during burn verify.
bad show during initialization of id track.
most often happens with cd/dvd from non manufacture branded, ie, radio shack,
office depot, etc.
from cd/dvd makers is rare.

old:

sometimes it will be a low 10 to 20 percent. some times more/less.
bad show in inner tracks,
bad show during read of id track.
most often happens with cd/dvd from non manufacture branded, ie, radio shack,
office depot, etc.
from cd/dvd makers is less.

causes for bad old:

defect is for a group of a stack.
bad show in inner tracks.
bad show during read of id track.
most often happens with cd/dvd from non manufacture branded, ie, radio shack,
office depot, etc.
cd/dvd errors happen from 'holes'.
bad scratches, can be recover some times buffing, some places offer service.
older they get, worse the errors.

sticking with well know coating brands, tho any can have bad runs. i would
guess reputable creators destroy by lots, some may pass off to off brand
labelers.


drives:

bad can happen from drive going bad. show start with dvd's, progresses to cd's.
bad drive starts during burns, progresses to reads.
bad drives with read errors starts with burn read errors. commercials check
as good. progresses to commercial.

some times using different burn programs works. possible because of checking
routines and failure rate. some read routines may allow for accumulation of
reads to 'rebuild' data. number of reads to build varies.


i do not keep records for such, % is guesstimate, just recalling from memory.

ymmv. ikmd.


-- 

peace out.

in a world with out fences, who needs gates.

sl6.3 linux

tc.hago.

g
.