>Tothwolf wrote:
> I've had good luck with Taiyo Yuden discs that I got from some software
> vendors (custom software in small batches), but I've not used them much
> myself. I had horrible experiences with a couple types of CD-R media
> (burned by other people where I worked), and it pretty much put me off of
> CD-R in general. Of course, then we had the flooding down here in Houston
> in 2001, which ruined (* maybe?) 100s of CD-R backups, while the older
> tapes were/are salvageable.
Jerome Fine replies:
I purchased some Memorex 24X BLACK CD-R 700 MB 80MIN
24X SPEED PREMIUM QUALITY CD-Rs from a store in Toronto
that carries many brands. These were a bit higher in price for a box of
10 CD-Rs in plastic cases as opposed to a spindle.
The underlayer is clearly black in colour. Can anyone comment as
to the quality of these ones?
> * - Does anyone know how to recover CD-R media that was submersed in very
> nasty water/sewage for the better part of two weeks? (They've since been
> cleaned/decontaminated) I didn't notice much in the way of physical damage
> to the reflective layer, but I suspect there may be some discoloration of
> the reflective layer at fault in some cases. I didn't have much luck with
> 'dd' on a Linux box, but perhaps there are better methods, possibly by
> somehow reading the CD-R directly, one bit at a time?
I use Ersatz-11 under E11 to check all of my CD-Rs AFTER I burn them.
I run RT-11 and compare every 2048 byte sector with the ORIGINAL
file image that I used when I ran the "Burn Image" option under Nero Burning
using Windows 98 SE. It takes me about 8 minutes (22 seconds * 20 RT-11
partitions of 65536 blocks each) to compare a full CD against the original
file.
I presume that I could also use RT-11 to copy the same data back to
the file - in general I have had no success in making an exact copy of the
contents of a CD using Nero - or any other method for that matter. The
only minor problem is that under the hobby version of E11, you can NOT
see the first 16 sectors (64 blocks of 512 bytes). For all ISO 9000
CD file structure, that is not a problem since it is all zeros in any case.
Nero Burning does copy those blocks, but hobby E11 can NOT read
them. Even Full E11 can't read those first 16 sectors if mounted under
the CDROMn: designation. A SCSI drive must be used instead.
If you need those CDs burned again, I can help you, although it sounds
as if this is a commercial application. PLUS, under RT-11, block 65535
of every RT-11 partition is a wee bit difficult to write to the destination
RT-11 partition if you don't know how - until I modify DUP to do it
as a standard request in RT-11. Normally I automate the VERIFY
portion of the operation when it is being done since 20 BINCOM
requests are a pain to initiate when more than one CD-R is being
verified. I just verified about 2 dozen, so it was quite easy to do
each one.
Please let me know if I can help!
Sincerely yours,
Jerome Fine
--
If you attempted to send a reply and the original e-mail
address has been discontinued due a high volume of junk
e-mail, then the semi-permanent e-mail address can be
obtained by replacing the four characters preceding the
'at' with the four digits of the current year.
Received on Mon Nov 11 2002 - 09:56:00 GMT