Re: dvd drive plays cds but says there is no disk when dvd is inserted
- From: "Dorothy Bradbury" <dorothybradbury@xxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 26 Dec 2005 21:30:03 GMT
Reading the disc
o Stick the disc in the freezer compartment
o Worked without fail on every dead CDR I've ever had
o Repeat if you can only get part way - media heats up *fast*
Reliable DVD is DVD-RAM
o Try a LG Multi drive & DVD-RAM disc
o Have gone through several drives to prove cross-drive reading
o So far no problems, broadcast & graphics people like them too
Hence I moved from MO 3.5" to DVD-RAM (MO) 5.25".
DVD-RAM is not DVD-R...
o It is a Phase Change Media
---- laser heats a bit of data above Curie point
---- magnetic field then flips the bit
o Writes then verifies after write
---- this DOES impose a significant performance penalty
---- however it also decreases frisbee at the data level
---- a 5x DVD-RAM drive is now about bearable on speed
o Better error checking & recovery
---- more like a hard drive than audio-derived DVD+/-R
Basically a modern implementation of Magneto Optical media,
without very high drive cost & very high media cost. Not as good
as Blue Laser MO, but for practical purposes more economic.
Rewriteable...
o Creates less landfill in the end than DVD+/-R
Two tapes of DVD-RAM drive...
o Panasonic
---- allows bare DVD-RAM disc & cartridge DVD-RAM disc
---- latter is more rugged, a super-sized MO disc
o LG
---- only allows bare DVD-RAM disc
---- Type-4 cartridges allow easy disc removal for use & storage
I prefer the Type-4 for the physical protection.
Computer storage takes two routes...
o Audio developed -- DAT, CDR, DVD
---- short-comings from being a consumer audio technology
---- shared consumer audio mechanism for low cost
o Computer developed -- DLT, Magneto Optical
---- DLT from open reel tapes, developed for data
---- Magneto optical also developed for data
o Hybrid -- DVD-RAM
---- use consumer developed mechanism for low cost
---- use Magneto Optical Phase Change media for reliability
Media usable with DVD-RAM Video Recorders.
DVD-RAM drives are cheap enough to...
o Have 2 drives @ 35ukp each
o So verify one disc in the other drive re readability
---- re calibration, in spec, written correctly
o Plus provide a proven recovery path if the other drive fails
---- contrast with keeping a spare MO or DLT drive
Dump the backup media & device when a better one comes
along, because eventually makers will dump media quality :-)
Once it moves out of cash-cow into cash-dog status.
--
Dorothy Bradbury
www.dorothybradbury.co.uk for NMB-MAT & Panaflo (Panasonic Industrial) fans
.
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