Finally some CD-R with 64µm ATIP wavelength have arrived. At least I think they have the longer spatial period forcing the drive to linear velocity 1.4m/s to reach 1x data rate.
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They are so old some that many applications fail interpreting the data, including cdrecord.
ATIP info from disk:
Indicated writing power: 5
Is not unrestricted
Is not erasable
Disk sub type: Medium Type A, high Beta category (A+) (3)
ATIP start of lead in: -9975 (97:49/00)
ATIP start of lead out: 79981 (17:48/31)
Disk type: unknown dye (old id code)
Manuf. index: 0
Manufacturer: Unknown old Manufacturer code
Alcohol 120% fails as well, but Nero and PlexTools detect TDK as manufacturer. Hard coded? Wrong detection?
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Interesting with these old discs is the reaction of a pretty new BD drive, bought in 2022. When inserting a common 80min/700MB disc the minimum write speed offered is 16x. Inserting the old mini CD-R leaves only a single option: 8x
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Screenshot above shows in Nero DiscSpeed that the Plextor Premium is also only willing to use 4x and 8x despite being able to go up to 52x CAV mode on new CD-R.
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Mavica discs are hard to find, at least in Germany. Still some eBay offers left in the USA, but shipping costs to Europe are beyond good and evil. Those 20 (which have cost me way too much already) on the picture above is probably all I will ever be able to get.
Once there is some kind of speed/seek times test application I would be willing to use one or two for this. Same for a Tonyhax International disc (once no updates are expected anymore).
Sadly no testing commercial games on CD-R with longer ATIP wavelength… with the full-sized discs being so overly expensive: This is out of range for hobby.