Path: csiph.com!eternal-september.org!feeder.eternal-september.org!.POSTED!not-for-mail From: =?UTF-8?Q?Niocl=C3=A1s_P=C3=B3l_Caile=C3=A1n_de_Ghloucester?= 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: DVDs are worse than CDs Date: Sat, 8 Nov 2025 17:44:18 +0100 Organization: A noiseless patient Spider Lines: 252 Message-ID: MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="708268602-1425304752-1762619917=:1331844" Injection-Date: Sat, 08 Nov 2025 16:44:24 +0000 (UTC) Injection-Info: dont-email.me; posting-host="c4521e71f64db31252d9815c4c1d0705"; logging-data="2850981"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/joU2R6dGNx+zC0R0JorFTZ6/vV8JR8Vfck4gvoCwBLQ==" Cancel-Lock: sha1:OSfphkcaweq2p1A/ys6ih/MDyYw= Xref: csiph.com it.comp.hardware.cd:130 nl.comp.dvd-branden:731 comp.publish.cdrom.hardware:20 rec.video.dvd.misc:105 it.comp.hardware.dvd:1254 alt.comp.periphs.cdr:16 This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --708268602-1425304752-1762619917=:1331844 Content-Type: text/plain; format=flowed; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE "Error posting message: 441 Article rejected by Spamassassin" said Alpine but I am not trying to spam. I recently made a webpage, i.e. HTTPS://Gloucester.Insomnia247.NL/media/media.HTML I copied and pasted from it to a submission to the USENET but Spamassassin= =20 does not like that. So I removed parts. If you are interested, then it may= =20 be sensible to read this webpage instead of just these excerpts on USENET. "Which medium is good? An SSD (Solid-State Drive) is better than a Hard-Disk Drive (HDD). Cf. a=20 webpage by excellent Adaist Jeremy Grosser's Legitimate Data Company LLC:= =20 HTTPS://DiskPricing.com/faq and HTTPS://WWW.StorageReview.com/ssd-vs-hdd SSDs and internal hard disks are preferable to DVDs and CDs. Avoid USB flash sticks and USB external hard disks. Operating systems are= =20 buggy and USB ports do not always remain properly powered (especially=20 lapstops old computers' and notebook old computers' USB ports). Files'=20 names on USB external hard disks and on USB flash sticks tend to become=20 destroyed. Writing to a flash memory destroys a flash memory. Using a=20 hard disk destroys a hard disk. Using a USB product destroys a USB=20 product. A DVD is worse than a CD. Cf. "There are some anecdotal reports that=20 DVD=C2=B1Rs have separated due to adhesive failure or that the metal layers= =20 have corroded due to the chemical reactivity of the adhesive. An=20 accelerated aging study looking at the stability of DVD formats found=20 this to be potentially an issue, at least under elevated temperature and=20 RH conditions (Iraci 2011)." says=20 HTTPS://WWW.Canada.Ca/en/conservation-institute/services/conservation-prese= rvation-publications/canadian-conservation-institute-notes/longevity-record= able-cds-dvds.html=20 (Cf. "Newer doesn't mean better. Newer means newer!" said a physicist at=20 Spain.) HTTPS://WWW.Canada.Ca/en/conservation-institute/services/conservation-prese= rvation-publications/canadian-conservation-institute-notes/longevity-record= able-cds-dvds.html=20 said that a gold CD-R is better than a silver(-alloy) CD-R.=20 HTTPS://WWW.Canada.Ca/en/conservation-institute/services/conservation-prese= rvation-publications/canadian-conservation-institute-notes/longevity-record= able-cds-dvds.html=20 gave me the impression that a "phthalocyanine" CD-R is better than an=20 "azo" CD-R. The DVD+R Double Layer company that is called Verbatim=20 advertises that it made a DVD+R DL with "AZO recording layers". Is "azo"=20 "AZO"? A "multi-layer format" is worse than a "single-layer recordable DVD"=20 according to=20 HTTPS://WWW.Canada.Ca/en/conservation-institute/services/conservation-prese= rvation-publications/canadian-conservation-institute-notes/longevity-record= able-cds-dvds.html A gold DVD-R is less bad than a non-gold non-CD-R, according to=20 HTTPS://WWW.Canada.Ca/en/conservation-institute/services/conservation-prese= rvation-publications/canadian-conservation-institute-notes/longevity-record= able-cds-dvds.html A DVD-RW is much worse than a CD-RW, according to=20 HTTPS://WWW.Canada.Ca/en/conservation-institute/services/conservation-prese= rvation-publications/canadian-conservation-institute-notes/longevity-record= able-cds-dvds.html Do not write to a CD or a DVD or a flash medium more than a few times.=20 Write to a DVD or a CD preferably approximately 1 time. "Store the discs properly: in a standard-size jewel case without=20 additional materials in the case" says=20 HTTPS://WWW.Canada.Ca/en/conservation-institute/services/conservation-prese= rvation-publications/canadian-conservation-institute-notes/longevity-record= able-cds-dvds.html A DVD+R is worse than a DVD-R according to=20 HTTPS://WWW.Canada.Ca/en/conservation-institute/services/conservation-prese= rvation-publications/canadian-conservation-institute-notes/longevity-record= able-cds-dvds.html=20 (Cf. "Newer doesn't mean better. Newer means newer!" said a physicist at=20 Spain.) A BD-R has "poor stability compared to" a CD or a DVD according to=20 HTTPS://WWW.Canada.Ca/en/conservation-institute/services/conservation-prese= rvation-publications/canadian-conservation-institute-notes/longevity-record= able-cds-dvds.html=20 (Cf. "Newer doesn't mean better. Newer means newer!" said a physicist at=20 Spain.) A CD-RW is much worse than a CD-R, according to=20 HTTPS://WWW.Canada.Ca/en/conservation-institute/services/conservation-prese= rvation-publications/canadian-conservation-institute-notes/longevity-record= able-cds-dvds.html The best technique to maintain a CD or a DVD is not clear to me. I am a computer scientist. No lecture and no class note and no textbook=20 for my computer-science degree is about CDs or DVDs. Many computers from=20 my computer-science degree do not have even a CD drive. I do not know=20 each thing about a CD or a DVD. I interpret this picture of (pressed (i.e. not burnt)) orthogonal DVDs to= =20 show Mork & Mindy to be horizontal with a pressed "surface face down" and= =20 Transformers to be "vertical". (Am I mistaken?) The DVD-R company that is called Kompact says: "store the disc in a case=20 with recording surface face down." I am having a trouble with this quoted paragraph of=20 HTTPS://WWW.Canada.Ca/en/conservation-institute/services/conservation-prese= rvation-publications/canadian-conservation-institute-notes/longevity-record= able-cds-dvds.html=20 - "Store discs vertically in standard-sized jewel cases. Paper or plastic= =20 sleeves are not recommended as they provide little physical protection,=20 they may interact chemically with the disc". Do I misinterpret this=20 quoted paragraph by the Canadian Conservation Institute? To me it seems=20 to contradict Kompact saying: "store the disc [. . .] with recording=20 surface face down." What are "jewel cases"? An Oxford dictionary failed=20 to inform me. A Merriam-Webster website explains that they are plastic.=20 Why are "plastic sleeves [. . .] not recommended" but "jewel cases" are=20 recommended? If "plastic sleeves" and "jewel cases" are plastic, then are= =20 they equally dangerous of interacting "chemically with the disc" and=20 scratching? What are "standard-sized jewel cases"? Many a jewel case for a DVD is=20 much bigger than a DVD as with this picture of Mork & Mindy and=20 Transformers, but many a jewel case for a CD is almost as small as a CD. HTTPS://WWW.Canada.Ca/en/conservation-institute/services/conservation-prese= rvation-publications/canadian-conservation-institute-notes/longevity-record= able-cds-dvds.html=20 is about media which are recorded onto via lasers. Is it also applicable=20 to pressed CDs; DVDs; and Blu-ray discs? Slowly burn. HTTPS://WWW.Canada.Ca/en/conservation-institute/services/conservation-prese= rvation-publications/canadian-conservation-institute-notes/longevity-record= able-cds-dvds.html=20 recommends to record slowly. water "In humid tropical climates, care must be taken to find discs that stand=20 up to the weather. One user reported that the data layer on [. . .] discs= =20 began cracking after a couple of months in an otherwise sheltered=20 environment (e.g. no direct sunlight).;" said CDRFAQ.org. Do not permit relative humidity to be higher than 50% according to=20 HTTPS://WWW.Canada.Ca/en/conservation-institute/services/conservation-prese= rvation-publications/canadian-conservation-institute-notes/longevity-record= able-cds-dvds.html Alas it is difficult to permanently maintain relative humidity at below=20 64%! (I used to succeed at a humid place during days to reduce relative=20 humidity to below 50%, but during nights relative humidity is badly big.) "Do not leave the [grey] disc [. . .] in [. . .] excessive moisture" said= =20 Capcom(R) Classics Collection Vol.1 without an explanation as to what=20 "excessive moisture" is. A page for a TDK 2x DVD-RW shows"10~90%": is this a warning to stay=20 within circa 10% - circa 90% relative humidity? A page for a Verbatim 8x DVD+R DL shows"6-85%": is this a warning to stay= =20 within 6% - 85% relative humidity? A page for a Verbatim CD-R shows"10-80%": is this a warning to stay=20 within 10% - 80% relative humidity? LASERs can not be maintained forever. "Subject: [5-27] Will the laser in my drive wear out? (2002/12/02) Yes, eventually. Depending on a number of factors, though, it's quite=20 possible that your device will suffer mechanical breakdown or simply=20 become obsolete before that happens. There are many different ways to construct a laser diode. Different=20 approaches result in different wavelengths, maximum power levels, and=20 lifetimes. The lifetime of a laser is usually measured as MTTF (Mean Time= =20 To Failure) at a particular power level and ambient temperature (e.g.=20 10,000 hours at 5mW and 50 degrees Celsius). Higher power levels mean higher heat dissipation -- the optical=20 conversion efficiency of a laser diode is around 30% -- and in the=20 semiconductor world, more heat usually equates to shorter lifetime.=20 Recording for an hour at high speed will take a greater toll on the laser= =20 than playing a CD for an hour. [. . .] Laser diodes can suffer catastrophic failure (they suddenly stop working)= =20 or gradual degradation (reduced optical power for a given input power=20 level). [. . .] However, if the laser's efficiency is reduced, more DC=20 power must be supplied, more heat is generated, and the likelihood of=20 failure increases." said HTTPS://WWW.CDRFAQ.org/faq05.html#S5-27 E.g. Mike Swaine recommends to back up frequently, but backing up=20 frequently can destroy a backing-up LASER! I used to use the same LASER to record (more than) the discs like which=20 are reported by this table. Almost each of these discs is almost full=20 (e.g. almost 702 MB for a normal CD and almost 4.7 GB for a normal singly= =20 layered DVD. [HTML table . . .] I never detect a problem with a disc from this drive. "Subject: [5-2] How long do CD recorders last? (1998/04/06) The MTBF (Mean Time Between Failures) on these drives is typically 50,000= =20 to 100,000 hours, and they come with a 1 year warranty. Compare that to=20 hard drives rated at between 500,000 and 1,000,000 hours with a 3 or 5=20 year warranty and that should give you some idea. Most of the drives available today weren't meant for mass production of=20 CD-Rs. [. . .] Incidentally, MTBF is not an estimate of how long the drive will last.=20 Rather, it's an estimate of the failure rate of the drives during the=20 expected lifetime of the device. Once you exceed the expected lifetime,=20 which is often on the order of a couple of years, the anticipated failure= =20 rate increases. If you have new drives with an MTBF of 25,000 hours, and=20 you run 1000 units for 100 hours, you can expect to see four of them=20 fail. It does NOT mean you can expect them to run for 2.8 years and then=20 all fail at once." said HTTPS://WWW.CDRFAQ.org/faq05.html#S5-2 " says HTTPS://Gloucester.Insomnia247.NL/media/media.HTML by me. If I made a mistake, then please consider warning me! --708268602-1425304752-1762619917=:1331844--