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+--- Thread: Are dual layer DVD-Rs and DVD+Rs reliable? (/showthread.php?tid=31221)
Are dual layer DVD-Rs and DVD+Rs reliable? - laarree - 04-09-2007
I received a dual layer DVD from a photographer today for the first time, with
c. 6.5 GB of images on it. I've been trying to copy files off this sucker --I've
got a MacPro with two optical drives here at work, so I have the appropriate
hardware to read it. I've been getting numerous read errors--I've gotten most of the
files off this disk, but many are apparently unreadable.
For all I know the photographer didn't verify his write to this DL-DVD (bad boy!),
but the dual layer factor makes me uneasy. Have people here had good
experiences with dual layer media, e.g. found them to be as reliable as single
layer media?
Re: Are dual layer DVD-Rs and DVD+Rs reliable? - jdc - 04-09-2007
sure, why not?
every movie you buy on DVD is DL
Re: Are dual layer DVD-Rs and DVD+Rs reliable? - Harbourmaster - 04-09-2007
You should have no problems with a correctly formatted & verified disc.
I would surmise that you are correct and the disc was not verified after writing.
Re: Are dual layer DVD-Rs and DVD+Rs reliable? - laarree - 04-09-2007
[quote jdc]sure, why not?
every movie you buy on DVD is DL
That may be so, but there is a difference between a DVD burned in a computer
and a commercially-manufactured movie DVD.
Re: Are dual layer DVD-Rs and DVD+Rs reliable? - MacMagus - 04-09-2007
All sorts of things might be wrong... the original files might be corrupt for all we know.
I'd first double check that the disc's surface is clean, then try it in a different optical drive and if there's still a problem I'd use Toast to get info on the disc and see what kinds of sessions are on it.
Re: Are dual layer DVD-Rs and DVD+Rs reliable? - laarree - 04-09-2007
[quote MacMagus]All sorts of things might be wrong... the original files might be corrupt for all we know.
I'd first double check that the disc's surface is clean, then try it in a different optical drive and if there's still a problem I'd use Toast to get info on the disc and see what kinds of sessions are on it.
I did check the disk's surface, and tried reading it in both of my MacPro's optical drives.
It's a single-session disk. About 600MB of the 6.5 GB total were unreadable files
(a collection of several hundred RAW and jpg pairs).
Re: Are dual layer DVD-Rs and DVD+Rs reliable? - jdc - 04-09-2007
i agree, not sure if he was asking about the reliability of the actual disc, or of the burn
the subject led me to believe he was asking about the actual discs...
Re: Are dual layer DVD-Rs and DVD+Rs reliable? - MacMagus - 04-09-2007
> I did check the disk's surface, and tried reading it in both of my MacPro's optical drives.
I did mean YET ANOTHER optical drive. Preferably on another computer.
Re: Are dual layer DVD-Rs and DVD+Rs reliable? - laarree - 04-09-2007
[quote MacMagus]> I did check the disk's surface, and tried reading it in both of my MacPro's optical drives.
I did mean YET ANOTHER optical drive. Preferably on another computer.
Nope -- didn't try that.
[quote jdc]i agree, not sure if he was asking about the reliability of the actual disc, or of the burn
the subject led me to believe he was asking about the actual discs...
Kinda both. Like I said, this is the first time I've been handed a homegrown
DL data DVD with files on it., and having readability issues with it on a current-
generation Mac with current-generation optical drives makes me want to do
some reality checks.