data verification error

Member

14. June 2008 @ 17:30

Link to this message

hey ...
i am using sony light scribe dvd writter...recently i have noticed that my writter gives me a data verification eror..sometime it doesnt and sometimes it does..i usually use a princo dvd ..so any idea what is wrong

Moderator

14. June 2008 @ 23:27

Link to this message

Sounds like the discs you're using to me - Princo ain't the best by far.

Switch to some better stuff like Taiyo Yuden or Verbatim.

Forum Rules
Do this before posting
Do not click this link...

Member

15. June 2008 @ 04:33

Link to this message

see perhaps but the thing is that it never gave me before..i mean i have done around 25-30dvd game written but all of asudden now..could u tell me that is it necessary for data verificaton because yesterday i just burnt a game without a data verification ..so it will work right and same day i had written previous to this one and in that i got the error ..so will that dvd work or not...all the dvd that i write are data dvd

Moderator

15. June 2008 @ 05:09

Link to this message

data verification isn't to be trusted, far more accurate to use something that does CRC scans ie checks for data corruption; burning programs don't always tell you when a burn really is complete, never mind be able to verify correctly...

edited for spelling

Main PC ~ Intel C2Q Q6600 (G0 Stepping)/Gigabyte GA-EP45-DS3/2GB Crucial Ballistix PC2-8500/Zalman CNPS9700/Antec 900/Corsair HX 620W
Network ~ DD-WRT ~ 2node WDS-WPA2/AES ~ Buffalo WHR-G54S. 3node WPA2/AES ~ WRT54GS v6 (inc. WEP BSSID), WRT54G v2, WRT54G2 v1. *** Forum Rules ***

This message has been edited since posting. Last time this message was edited on 15. June 2008 @ 06:00

Member

15. June 2008 @ 05:56

Link to this message

so in short you saying that even if i do write a dvd without there are chances that the dvd will work..

Moderator

15. June 2008 @ 06:05

Link to this message

What i'm saying is that a burning program will say it's complete even if it's not. DVD Video is a prime example, you burn a dvd and it says complete, you then go to watch the movie and it might skip and stutter. To test the disc properly you would do a CRC scan, then the skipping would be shown up by the bad sectors from the CRC scan.
Verification (in a burning program) seems to be just as hit and miss as the actual burn, so i don't trust it. A good way to avoid having to worry about whether burns complete (and to avoid having to CRC scan every disc) is to use decent media. You could CRC scan a few discs, then stop scanning once you feel comfortable with the discs/burning process. or if you want, you can CRC check every disc.

At work i have to produce business critical backup dvd's of customer data each month. Long ago we used to have corruption problems on discs ie we would try to copy data off the discs and found problems, the discs were subpar. So what we started doing then (and still do, a few years later) is to checksum each and every dvd on a separate drive than we use for burning those discs. (i use Linux to burn and to checksum, it's basically the same as CRC scanning). Since we moved to decent media (Verbatim, the old discs were horrid Imation discs) there's never been a corruption error again, though out of habit i still checksum every disc.

This message has been edited since posting. Last time this message was edited on 15. June 2008 @ 06:10

Member

15. June 2008 @ 06:06

Link to this message

okies..thanks a lot for the info..lemme c if it works out fine with sony dvd..

Moderator

15. June 2008 @ 06:11

Link to this message

OK, p.s. i just edited the post while you were replying...

Member

15. June 2008 @ 06:16

Link to this message

alryt got it..what next i want to ask is by any chance is there a software that checks a dvd before wirttin wheather its proper or not since i usually end up keeping my dvd here and there or in the cd plastic box for months .so before writting is there a possible way to know that the dvd will surely work

Moderator

15. June 2008 @ 06:24

Link to this message

No you can't ever be 100% sure. You should CRC scan each disc to be sure. I also burn lots of discs and not need to use them for months, but i don't CRC scan. I only use decent media you see. Also, you can't be sure if a burner is starting to fail i use quite a few different burners on my machines, so the chances of bad burns are hopefully further reduced.

This message has been edited since posting. Last time this message was edited on 15. June 2008 @ 06:25

Senior Member

1 product review

18. June 2008 @ 18:48

Link to this message

In terms of data discs, a couple of CRC errors is ok? or No?

I noticed I have 5 or 6 CRC errors on older CMC Mag movies, of course they play fine. It's data discs that I'm worried about.

Moderator

18. June 2008 @ 21:02

Link to this message

None are really good BurningAs. Those crc errors will stop the disc from being ripped fully.
A dvd player is more forgiving and might pass over crc errors without you even noticing if they're not that bad. The worse they get though the more you'll notice in playback.

Now ripping your drive tries to rip every byte - this is where the crc errors stop it. You can use something like isobuster that will insert dummy data in a bad byte but if it's too many it will affect the integrity of the data.

Forum Rules
Do this before posting
Do not click this link...

Senior Member

1 product review

22. June 2008 @ 00:56

Link to this message

Originally posted by binkie7:

Now ripping your drive tries to rip every byte - this is where the crc errors stop it. You can use something like isobuster that will insert dummy data in a bad byte but if it's too many it will affect the integrity of the data.

ahh, I remember using ISObuster before. So ripping with it will let the drive pass over the CRC errors?

Moderator

22. June 2008 @ 17:09

Link to this message

Well sorta - you'll get a popup w/ isobuster with some options like asking if you want to insert dummy data, skip or cancel (may not be the exact words but something along those lines).
So picking skip or the insert option will get the disc ripped but if you use either of those options too many times it probably isn't worth it.

Forum Rules
Do this before posting
Do not click this link...

varnull

Suspended permanently

23. June 2008 @ 07:21

Link to this message

plus you are likely to end up with the drive in PIO mode, and puzzlingly slow until you think of it.

I haven't ever in my memory done an integrity check on a burn. Good burners and disks see, plus a stable OS

Senior Member

1 product review

25. June 2008 @ 11:08

Link to this message

Is is better to insert with dummy data for skip? I did a disc with dummy data and it was fine, at another disc too many sectors are bad and it took 2 hours just reading and still no go. I had to cancel it. That disc didn't get copied. It was only at 99% where this issue occured. Is there a program that lets me just insert dummy data at volume, and not 1 sector at a time?

Moderator

25. June 2008 @ 15:25

Link to this message

I think isobuster has an opinion to insert dummy data when it hits a bad spot. Something like always do the selected - along those lines.

I'm not sure which is better - skip or dummy data. My quess is they are both equal and it depends on how much dummy data/skips and how close the sectors are that will make the biggest diff in playback ability. In this case more is not better :)

Forum Rules
Do this before posting
Do not click this link...

varnull

Suspended permanently

25. June 2008 @ 17:51

Link to this message

Lots of burning apps seem to have a skip option... but they usually take forever and a day with something stupid like 128 read attempts before skipping.

threre is a funny pair of programs about which seem to do quite well.. one is free, called unstoppable copier (unstopcopy by roadkil) which seems to do the job (or did back when) and then there is payware cd/dvd data rescue which takes weeks and weeks, but does what it says on the tin.

I think for a film or music a few small gaps are preferable to a crash, but for data.. I would guess perfect or you will get all kinds of strange happenings.

Senior Member

1 product review

26. June 2008 @ 11:28

Link to this message

Originally posted by varnull:
payware cd/dvd data rescue which takes weeks and weeks, but does what it says on the tin.

Don't bother with that. I have used it before. It DOES take Weeks!

We need a software that reads bad sector once and just insert dummy data. ISObuster definitely doesn't just read it once.