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| From | Nioclás Pól Caileán de Ghloucester <Spamassassin@irrt.De> |
|---|---|
| Newsgroups | it.comp.hardware.cd, nl.comp.dvd-branden, comp.publish.cdrom.hardware, rec.video.dvd.misc, it.comp.hardware.dvd, alt.comp.periphs.cdr |
| Subject | dvdisaster or QuickPar or etc.: do you use them to secure discs? |
| Date | 2025-12-06 01:05 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <4ab6702f-a8ca-bb87-bcf4-3856fd1ce393@irrt.De> (permalink) |
Cross-posted to 6 groups.
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|----------------------------------------------------------------------| |"Re:Timely article... (Score:3, Informative) | |by WuphonsReach ( 684551 ) on Saturday January 24, 2004 @12:01PM | |(#8075344) | |TY's (as the other posted commented) are reported to be the best CD-R | |/ DVD-R that you can get. [. . .] | | | |In addition you should be looking to add parity/recovery data to your | |CD-R/DVD-R backup files, which serves two purposes: (a) allows you to | |verify that the files are still readable and intact (b) allows you to | |recover damaged files if you have enough recovery data. It allows you | |to recover from scratches that the underlying ECC was unable to | |correct for. | | | |The easiest product to use right now is called PAR or PAR2 | |[sourceforge.net] (I prefer QuickPar). Basically, put all of your | |files in a single folder (or zip things up into seperate archive files| |and put those in a single folder) and then use QuickPar to create | |recovery data. For a CD-R, I usually collect around 650Mb of data | |together, and then create another 45Mb of recovery data. For DVD-R, I | |do 4Gb of data and 0.35Gb of recovery data." | |----------------------------------------------------------------------| says HTTPS://SlashDot.org/story/04/01/24/0054242/guide-to-digital-preservation-from-nist Do you use anything like them? |----------------------------------------------------------------------| |"profdredd - 2006-12-24 | |I'd like to use QuickPar, or par2cmdline, to protect archives stored | |on CD-R and DVD-R media. Is there a tutorial or FAQ describing in | |detail how to do this? | | | |By "archive" I mean data frozen in permanent storage on optical | |discs. I don't mean a "backup" where the data also exists on the PC, | |or other media besides optical disc. In this scenario, I feel the | |parity recovery capabiltiy provided by Par2 is very valuable. | | | |I've read the documentation for QuickPar, but it only covers Usenet | |usage. I've also read the tutorials linked from the QuickPar site, but| |they only cover Usenet usage. | | | |I've read the forums on the QuickPar site, every single message in | |"Using QuickPar with CDRs and DVDRs". The thread which seems most | |informative is "QuickPar Media Recovery - My Tests & Techniques", but | |it doesn't suffice as a tutorial. There doesn't seem to be much | |agreement about the best way to use Par2 data on optical media. | | | | | |Nobody/Anonymous | | | |Nobody/Anonymous - 2008-06-16 | |Have you try DVdisaster? They are pretty about that, free and | |cross-OS." | |----------------------------------------------------------------------| says HTTPS://SourceForge.net/p/parchive/discussion/96207/thread/7732c181/?limit=25# before more answers. HTTPS://dvdisaster.JCea.Es/downloads/manual.pdf says: |---------------------------------------------------------------------------| |"This is the orange manual, describing the usage of dvdisaster, a tool | |for creating error correction data (“ecc data”) for optical media such | |as CD, DVD and BD discs. Use cases for creating ecc data, recovering | |defective media using ecc data and for general maintenanance of | |optical media are given. [. . .] | | | |Copyright 2008-2017 Carsten Gnörlich. | |Copyright 2019-2021 The dvdisaster development team. | |Verbatim copying and distribution of this entire article is permitted | |in any medium, provided this notice is preserved. | | | |[. . .] | | | |Preface | |After the publishing of version 0.79.5, the project has been dormant | |for another half decade. As time has passed by, it is foreseeable that | |optical media will become extinct just like floppy discs did long | |ago. Still, it is important to preserve the contents of already | |existing optical media. Towards this end, we will maintain dvdisaster | |to keep it usable on current hardware and OS versions. | |[. . .] | | | |[. . .] | | | |1 Overview | | | |The challenge: Optical media eventually fail. Optical media | |(CD,DVD,BD) keep their data only for a finite time (typically for many | |years). After that time, data loss develops slowly with read errors | |growing from the outer media region towards the inside. | | | |The dvdisaster solution: Archival with data loss | |protection. dvdisaster complements optical media (,→ supported media) | |with error correction data in a way that they are fully recoverable | |even after some read errors have developed. This enables you to rescue | |the complete data to a new medium. | |Error correction data, in short “ecc data”, is either added to the | |medium or kept in separate error correction files. dvdisaster works at | |the image level so that the recovery does not depend on the file | |system of the medium. The maximum error correction capacity is | |user-selectable. | | | |1.1 Common misunderstandings about dvdisaster | | | |Before we describe in detail what dvdisaster can do, let’s first | |clarify what it can’t: | | | |dvdisaster can not make defective media readable again. Like a | |conventional backup, error correction data must be created from a | |fully functional optical medium - you can not backup data which has | |already been lost. When the optical medium develops defective sectors | |at a later time, those defective sectors are restored by | |re-calculating them from the ecc data. This won’t make the defective | |medium working again, but will produce a new iso image which can be | |written to a new medium. | |As said before, ecc data can not be created from already defective | |media. Although unreadable sectors can not be recovered in that case, | |dvdisaster might still be helpful in extracting the remaining readable | |portions of the medium. | | | |[. . .] | | | |BDXL-R | |• Currently only the three-layered (100GB) version is tested and supported.| |• Note: BDXL is not backwards compatible with standard BD drives. | | | |Not usable types (image can not be extracted): | |• BD-ROM (pressed BDs), DVD-ROM (pressed DVDs), CD-Audio and CD-Video. | | | |[. . .] | | | |Q 3.5: My self-written media is recognized as “DVD-ROM” and rejected. | |The medium book type has probably been set to “DVD-ROM”. Typically, a | |drive capable of writing the same media format is required for | |processing the medium with dvdisaster. | |For example, a two-layered DVD+R with a wrong book type may only be | |accepted on a writer which can write to such media. Try another drive | |for reading images in these cases." | |---------------------------------------------------------------------------| |-------------------------------------------------------------------| |"Nobody/Anonymous - 2006-07-22 | |Is there any point in using par for insurance for CDs for data and | |system backups? Involves a wild variety of file sizes and directory| |structures. Would it be as easy as just making 3 CD copies for each| |required, using an expensive brand of course (how else can you tell| |which really have 'long life')? When CDs fail, typically, does the| |whole become inaccessible, or is it file-by-file? | | | |Ol' Bab" | |-------------------------------------------------------------------| says HTTPS://SourceForge.net/p/parchive/discussion/96207/thread/b235af8b/?limit=25#9173/8fa4 before many responses. Thanks in advance for feedback!
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dvdisaster or QuickPar or etc.: do you use them to secure discs? Nioclás Pól Caileán de Ghloucester <Spamassassin@irrt.De> - 2025-12-06 01:05 +0100
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