I had a series of backup CDs that I had burnt some time ago. In order to consolidate the many discs I copied them all to my hard drive in separate folders, compressed them into .RARs (at maximum compression if memory serves me correctly), and burnt the files to a couple of dual-layer 8.5 GB DVDs.
I recently attempted to make an .iso image backup for my storage drive from these DVDs and about ~40% of the way in I start to get read errors. The same thing happens if I simply try to copy the files off of the DVD via Windows Explorer. Somewhere around the same part of the disc (I'd imagine) the copy speed drops to nil and then read errors occur. I'm guessing it's the second layer where the problem lies and that I possibly had the burn speed set too high when I created the disc. The DVD indicates that it can be written to at 8x, I may have accidentally written to it at 12x or something to that effect.
I've attempted to read the disc from my laptop's Blu-ray/DVD-RW drive - it won't even read the disc at all. The drive spins up for a while, attempts to read for a bit, and then quits. If I try to navigate to the drive in Windows Explorer then it pops up a message telling me to enter a disc into the drive.
Is there any read method or recovery software that'll allow me to recover the data from the corrupted disc? I badly need to be able to retrieve the files saved as it is now my only copy of the backups. I discarded the other CDs after I had burnt the consolidated DVD copy so if I'm unable to read the data on the DVD then I've lost years of archived files that I'd really prefer not to have lost.
As always, thank you for your assistance.
UPDATE 10/3/2011 7:45am MST
@lornix - Yes, I am reading the DVD from the same drive that it was written from. Currently I'm attempting to use ImgBurn at 1x to rip the DVD to an .iso and having it continue on through the read errors. It's been at 49% for hours now trying to read part079.rar, failing sector by sector.
Here's an example of the error message:
Retrying (20 of 20) Retry Failed - Reason: Timeout on Logical Unit Sector 1954510 maps to File: \BLABLA.part079.rar Failed to Read Sector 1954510 - Reason: Timeout on Logical Unit
It's been doing this sector by tedious sector for hours now; i.e. 1954510, 1954511, 1954512, etc with 20 retries between each failed attempt.
@Psycogeek - I have had this drive for years now (like 4.5), and while I have periodically pointed the business end of a can of air duster into the drive from time to time to keep it cleaned out it is entirely possible that the laser lens has a nice coating of "roadfilm" as you call it built up. Perhaps I'll have to give one of those CD/DVD cleaner discs with the fine brushes on it a shot. I've seen some nasty buildup cleaned out of drives using them in the past, and my drive is most definitely overdue for a treatment of that sort.
@DanBeale - I've not seen that bit of software before. I'll have to try it after I allow the current ImgBurn process to continue for a while longer. I have a few hours invested into it already, may as well let it continue while I sleep and see what the results are upon my awakening.
Thank you all!