
gregarious canid. avatar by ISANANIKA.
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In my DVD-RAM era, in case it wasn't extremely obvious. Allow me to share some of the useless information I've absorbed and find mildly intriguing.
DVD-RAM is most known in its "final" form, where it is 4.7GB (or sold as 9.4GB for double sided discs), matching regular DVDs perfectly in capacity. But, initially, there was a "version 1.0" of DVD-RAM which only stored 2.6GB (5.2GB for double sided)! Not talking about the 8cm discs for camcorders (I don't think they introduced those at all for version 1.0), no, these were full-size 12cm discs, but they had nearly half the capacity of regular DVDs! It's clear from how short-lived that version was and how quickly it was brushed under the rug that it was a case of "who cares if it's not finished, get it to shelves now!!!"
There are, I hear, some PowerMacs which included an official Apple-supported DVD-RAM drive that supported this 2.6GB standard, and accepted cartridges for such. I have yet to see any pictures or videos of any of those in use.
While there unfortunately was no successive "BD-RAM" as cool as that would have been, there was a precursor and effective "CD-RAM" developed almost exclusively by Matsushita called PD650. It looks almost identical to a cartridge-based DVD-RAM, even down to the disc, though it only stored 650MB. The drives for those discs could read CD-ROMs, and I may be mistaken but it may have been possible to read the PD650 discs in regular CD-ROM drives, given the data was organized in a non-illegal manner.
Drives made for that initial 1.0 version of DVD-RAM were backwards compatible with PD650 discs! However, it seems the finalized 4.7GB drives ditched that support, although I have yet to test that myself. Weird. I wonder if that means those elusive PowerMacs could also use the PD650 discs... 🤔
(ATI/AMD have had a lot more dud designs than NVIDIA, although NVIDIA have some pretty crap ones too)
[picture ain't mine but i've seen a bunch of 'em]