On Wed, Oct 09, 2019 at 12:50:49PM -0400, grarpamp wrote:
https://byuu.net/compact-discs/structure https://news.ycombinator.com/item?id=21185897
Full-raw (at least, below RSPC/CIRC) CD/DVD reader/writer "should be done" nowadays - with muti core CPUs and insane TFLOPs on GPUs, brute-forcing correction codes etc should be a no brainer. And with some fancy PRNG/crypto sequences, should be able to more cheaply (in data space/ 8to14 terms) handle the "too many 1s in a row" problem and get much closer to the raw actual 2.33GiB of a CD-ROM. Back in the day of the 486DX and lusty 60MB HDDs, CDs were a godsend and the fact they worked at all is apparently in hindsight amazing (1690MB of ECC etc, to get the remaining 640MB "reasonably stable/ error free over time"). But today, software defined analogue laser output decoding looks "entirely reasonable" and with many potential benefits.