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Petabyte SSD / memory card and DVD & CD audio disc

In netpage DRAMexchange is daily prices for RAM. If cheapest possible memory is used, that is not perhaps made for SSD but it is RAM, petabyte costs about 11 000 dollars. It is propably slow memory, but still usable because it is cheap. Some large datacenter has petabyte RAM, but it is in large RAID stations., and this petabyte in datacenter is expensive. One SSD or even “memory card” can have petabyte at 11000 dollar price. It would be much more compact than large RAID stations so datacenters then become more compact and cheaper, anyone can have petabyte SSD in his/hers computer. It might be slow memory but it is cheap memory. 100 TB SSD then costs 1100 dollars. This is available from memory manufacturers if someone just order petabyte SSD and makes some standard of it, petabyte is perhaps gigantic size SSD and perhaps needs outside module outside of PC. It then becomes “memory card” of petabyte size. Other useful thing is that digital movie cameras that use RAID to store digital picture, do not those anymore. Lighweight portable digital movie camera can hold petabyte or 100 TB memory card. So filming in jungle or desert or some other remote place is easy and simple, and also document films can be made using first class cameras, documents often require handheld cameras. Document films can be filmed digitally using 8K stereo (3D) and IMAX stereo digital cameras, in high quality cinema format. Cameras do not need RAID stations no more, that are expensive and heavy and not easily transported. Also TV programs can be filmed with high quality digital cinema cameras then, when cheap and large memory is available.
CD quality is not enough nowadays in audio. Super audio CD (SACD) has mostly disappeared. Really good quality is 32 bit floating point, in 96 khz. There was DualDisc and DVDplus formats. Making disc one size CD and another DVD or DVD ROM, DVD size can hold high quality sound. DVD audio format is not needed, DVD ROM, or DVD video will do where video stream is absolute minimum, showing low framerate and low pixel count still picture of black&white TV test picture music plays, audio comes from DVD video soundtrack. Not even two sided disc is needed, single side DVDplus disc can have CD section and DVD rom section of 32 bit floating point 96 khz and then DVD video section that has 5.1 surround track using 16bit 48 khz. Longest CD is Bruckner third symphony recording, 89 minutes. About 45 minutes is available in one side CD/DVD, then is 45 minutes losslessly compressed 32/96 sound in DVD ROM file, and then 45 minutes of 5.1 surround either losslessly compressed or DTS compressed with maximum DTS bitrate. All three sections are in one disc, in one layer but in different places of same disc, in three “rings”. DVDplus format supports this separate rings for CD and DVD?That 45 minutes is not exact but about that much is possible. About 45 - 48 minutes is perhaps possible. If one sided DVD section has two layers, one for DVD ROM another for DVD video, 50 - 54 minute CD and similar length DVD ROM uncompressed 32/96, and DVD video 24/48 5.1 surround is available. This disc then has just one side, that has one layer CD section, end besides two DVD layers for DVD ROM and DVD video. One layer CD surface is separate from two layer DVD in disc surface, one “ring” is CD surface and another is two layer DVD surface. DVDplus format support this kind of thing? The CD surface is thicker than DVD surface, so disc has then variable thick surface. There is Ecodisc DVD / CD manufacturing that is thinner than regular CD or DVD, and two layer Ecodisc DVDs are made. So Ecodisc may be solution to DualDisc problem that disc is thicker than regular CD or DVD. But even one side disc can have large amount of music in three formats, CD, 32 bit floating point 96 khz “Studio quality” stereo and 5.1 surround sound. FLAC does not support 32 bit FP, and mostly used FLAC players do not play 5.1 files, so some other lossless codec must be used. There is MQA compression, but it does not have multichannel support and it uses only FLAC. MQA supports 192 khz and even higher sample rates, and makes really compact almost lossless compression. Two layer DVD “ring” has lossless unpacked audio so it solves that FLAC format cannot be used problem, but DVD section in disc now needs two layers in one sided disc. Dual side discs have no capability problems.
Bluray disc can also be used as audio storage, either Bluray video soundtrack format like DVD video is used as audio storage, or better is to use BD ROM to store huge amount of audio data, 64 bit / 96 khz is then possible, and higher samplerates than 192 khz, when ROM audio file is used. If there ever is dual disc that has one side CD, Ecodisc CD etc., another side is Bluray that is used to store audio information in real hi-res studio quality in multichannel format and stereo, that would real multi format audio system, it will play as CD in all players but also has almost unlimited audio channel capacity and unlimited quality in Bluray side as BD ROM audio file or as DTS format etc.

If really good quality, studio quality audio distribution is needed, then it must be 32 bit floating point audio. No DVD video or Bluray support it, only 24 bit. 24 bit needs antialiasing filters, 32 bit FP does not. Only chance is ROM disc, DVD ROM or Bluray. BD ROM is only for 24 bit audio, and only for audio / video, not for PC soundfile like WAV. Only writable Bluray discs can store PC files, although Playstation uses Bluray to distribute games. In USA most Bluray players can t read writable Blurays. Only PC Bluray drive can read computer files, and they are almost non existent today, and even DVD ROM is becoming rare in laptops. But Dualdisc / DVDplus that has both CD and DVD ROM information either both sides or only one side, makes disc that CD player can play and DVD ROM player can have 32 bit FP / 96 khz and 24 bit / 48 khz 5.1 surround information. DVD standard does not support lossless compression and FLAC does not support 32 bit FP, so some other lossless compression must be used. In one side disc CD, 32/96 and 24/48 (or16/48) information can be in separate “rings”. There is hybrid disc DVD/CD called legacy disc or compatible DVD that has first layer DVD and second layer CD, and ordinary CD players can read that CD layer. So even disc that has in one side CD/DVD and another side two layer DVD (DVD ROM or DVD video, used only for audio purposes) is possible. Another way is to use disc where another side is Bluray that has computer soundfile information, now audio can be 64 bit FP / 96 khz for example, and unlimited surround sound, and another side is CD. So normal CD players can play disc, but there is also hi-res information that either DVD video player, DVD ROM drive, or Bluray drive can use.
For making cheap petabyte memory: LTO cassettes can be used. They are slow but cheap if mass produced like VHS cassettes. If LTO 9 standard is used, with 3 X compression, and tape width increased to 1 inch instead of 0,5 inch, and LTO cassette size to 10 inch (25 cm) instead of 4 inch (10 cm) LTO has then capacity of one petabyte. Digital cinema film cameras can now use, or virtual reality almost 360 degree multi view cameras, digital tape recorder that hungs on cameraman s or other persons shoulder and has petabyte capacity in one cassette. That shoulder recorder can be made a version that uses 100 TB or petabyte semiconductor “memory card”. This “tape recorder” can be also used as petabyte computer memory that is small and cheap and portable.
There is “hybrid DVD” called “chipped DVD” that has semiconductor ship inside for authorizing. Another rotating disc that has semiconductor memory is hard disc. Hybrid drive is hard disc plus IC chip memory. Can there be optical hybrid drive? Archival disc optical format disc, that has in each disc inside disc semiconductor memory IC chip. Chip or chips are between up and down sides of disc, in the middle of disc. 12 cm diameter is enough to have many chips. Chips used in phones etc. are very thin, and chip when made do not need plastic package if it is inside optical disc. Connection to PC etc. is in disc centre, in 20 mm hole in middle of the disc that contacts disc drive. Edge in disc of that 20 mm hole has connection points to disc drive, that has contact surface / peripherials for that IC chip inside optical disc. Or IC memory can be inside disc drive player, like in hybrid drive hard disc drive. Optical discs are much cheaper than hard discs, and Archive disc can hold 300 gigabytes. Price of disc if manufactured mass produced millions of units like Bluray has price per disc about one dollar or slightly more. So it is very cheap memory, and like hybrid hard disc drive contains cheap but slow storage (optical disc) and fast but more expensive IC memory. Optical discs are just so much more cheaper than hard discs. So bigger memory can be made much more cheaply than using hard disc RAIDs etc. in datacenters etc. and in home PCs.

Optical discs as memory are not expensive, according to Wikipedia Bluray costs as much as DVD to make, and in China factory order DVDs cost as less as 0,027 dollar for several thousands units order, or 0,009 dollar for over 100 000 units order according to Alibaba com. Magnetic memory IC in DRAMexhange in “flash spot price” is about 13 dollars / terabyte and in “wafer spot price” 11 dollars. Cheapest magnetic IC memory is still about 10 - 35 times more expensive per gigabyte than optical disc (Bluray). There is no Bluray RAM standard because of lack of interest, and even BD-ROM discs can store only video or audio, not computer program files, altough Bluray is used in Playstation etc. to distribute games (that are computer programs). If Bluray is used as optical memory, it must be like DVD RAM, eraseable much more times than BD-R 1000 times max, multiple layers and capable of storing computing programs. Only way to store program in Bluray is to manufacture factory made stamped BD-R disc, this can be played in Bluray drive. In audio distribution is then possible to use high quality Wav files, 64 bit floating point 96 khz, and not be limited by Bluray audio (soundtrack) standard of 24 bit integer. TDK made prototype of 16 layer single side Bluray, but not made commercial product of it because magnetic IC memory was developing fast. If 2 X 400 GB 16 layer Bluray rewritable disc cannot compete with magnetic memory specs, it can compete with price. And optical disc scales up cheaply, unlike magnetic memory, so if 30 cm or even 38 inch / 96 cm optical discs are made they are still cheap, much cheaper than similar capacity magnetic memory, because stampings etc. are needed one per disc, is disc 12 cm, 30 cm or 96 cm size. Multiple disc platters like hard disc drives can be used.
30 cm / 12 inch disc is about 10 terabytes if double sided 16 layers per side. Ecodisc manufacturing makes thinner and cheaper optical discs, it propably can be used to make Bluray. 96 cm / 38 inch disc has almost over 50 terabytes. Actual manufacturing price is only few dollars per disc, similar like manufacturing LP records or even cheaper. So optical disc has huge scaling efficiency compared to magnetic memory. Disc can be put to protective shell like DataPlay discs, that disc had only 32 mm size but big capacity (at the time) compared to other optical media because it used less error correcting codes, it did not need them because disc was tightly sealed and protected from dust and dirt. If optical data disc is similarly packed in protective shell, capacity per disc may increase about 2,5 times, and becomes even cheaper compared to magnetic memory. These discs in plastic cases can be put top of each other like platters in hard disc, in optical hard disc. Each disc platter can be removed and replaced individually from platter “tree” unlike magnetic hard disc. 100 discs 30 cm sized is one petabyte, this “hard drive” needs 100 read / write laser pickups (that are cheap). Long 100 disc platter “tree” can be changed loading it sideways, not from top. 128 discs sized 96 cm have 6,5 petabyte capacity, and size like washing machine is this hard drive . It is no more expensive than 30 cm disc drive because it has almost same amount of discs (laser picups etc), but bigger discs makes it to have more capacity. Those optical “hard drives” are much more cheaper than magnetic hard drive or memory IC. Even home PC can have 32 discs of 30 cm size optical drive that has 320 terabytes capacity but minimal price compared to magnetic memory of same size, because that disc drive is like DVD / Bluray player.
If optical disc is packed inside plastic case like Sony UMD disc, that almost completely surrounds disc (30cm or 96 cm disc), and is extensively protected against dust like Minidisc, then error compression can be different and it takes only slightly disc space. Error correcting codes from CD / DVD / Bluray extend data amount to 2,5 times larger than information itself, so with lesser and more modern and efficient error correction (turbo codes etc.) disc space can be about 2,5 times more. So 40 platters of 30 cm discs is then petabyte, and this 40 disc hard drive can PC have as extra module. It is super cheap petabyte memory for PCs. Magnetic tape that is petabyte size LTO is another cheap option, but slower than optical hard disc. 128 platter 96 cm disc drive has then over 16 petabytes capacity when discs are in plastic case.
For music distribution according to Wikipedia there was prototype CD / DVD hybrid that had first surface CD layer and behind it two layer DVD surface. So disc can have one side CD, DVD video layer (only audio channels are used, with static test picture), another DVD layer that is DVD-ROM for high resolution audio (64 bit not 24) and other side of disc is single layer or multiple layer Bluray with audio content. Real multi format disc that can be payed in multiple players and PC DVD drive or Bluray drive.
Bluray can have in same disc in same side two “rings”, one is Bluray soundtrack that can be played in Bluray players 24 bit, another ring is BD-R standard (factory made using stamping) computer file that has 64 bit audio. This 64 bit floating point music file can be made using similar high quality manufacturing like XRCD, with atom clock sync etc.
MQA is audio compression format but supports only FLAC, FLAC supports only 24 bit and most used FLAC players lack surround sound support. DVD video does not support FLAC. So MQA is problematic. Some other lossless compression than FLAC can be used with music Wav file.
Cheapest way to add surround sound is matrixed channels. Only 2 channels are enough, many channels are encoded inside those two like old Dolby cinema audio format. Modern version of matrix encoded sound can have unlimited amount of audio channels between two speakers. So 8 channel matrix format that uses 2 channels encoded, has 2 speakers 180 degrees apart, and then other 6 speakers in corners and in front and back of listener, can be made. This matrix surround can use analog audio, so vinyl LP or cassette can be encoded using it, and analog information has advantage that KLT transform can be used for multichannel sound. Also digital sound channels can be matrixed. There is some slight overlapping between channels but that matrix format is cheap way to compress surround sound for example internet music streaming and music download.
High Definition Vinyl is almost CD quality analog audio, and 45 rpm and 78 rpm discs can be made. Discs can be larger to have longer playing time for example in 78 rpm disc, 345 mm “14 inch disc” (it is 13,6 inches) is small enough that LP player dust cover does not touch 345 mm disc, and sound quality also improves when disc is bigger. Vinyl LP does not need extra weight like modern heavy LP discs, thickness of LP has nothing to do with sound quality, thinner and lighter LPs sound the same.
33 rpm discs can have High Com noise shaping / compander as extra module that is connected to LP player out cables, between LP player and amplifier, this noise shaping module can be sold as individual device, for all LP players. Cassette players can have same. It then needs that vinyl LP or cassette is encoded using High Com. High Com encoded LPs had already in early 1980s up to 120 db dynamic range, so better than CD. For digital sound there was early ATRAC compression methods that need no decoder, sound can be played back with any player, compressed and ready to use. So player does not need any decoding circuit, it just plays back sound that is already processed and compressed. That is easy way to make “MP3 player” that does not use MP3 or any other decoding method, it just plays back compressed sound. If those compression methods that do not need decompression are more developed today than early 1990s when those ATRAC versions were made I don t know. So this is real multi-format audio compression: any audio player can play back compressed soundfiles because they need no decoder. Is today (2020) available audio compression methods, audio codecs that need no decompression, so compressed sound can be played back in any system?
Holographic optical disc has been proposed. Even better would be holographic optical tape storage. That would have real huge capacity with cheap storage medium (optical tape on reels or cassettes). Optical tape even without holographic store has huge capacity (Folio Photonics). Magneto-optical disc is another way to make optical storage. 1990s / early 2000s was methods like LIMDAW and domain wall displacement detection DWDD. Used with modern optics both can be used efficiently. DWDD had “dramatic increase in storage capacity” but it was used with old Minidisc format and so then had to use only 2 X performance improvement there. Both had series production of devices that used them. New magneto-optical is using petrovskite, according to Wikipedia, but is in laboratory stage only (2016). LIMDAW or DWDD can be cheap optical disc / tape solutions for data store, optical RAM, modernised versions of them with modern optics like Archival Disc (which is not like DVD RAM, Archival disc is for long- term data storage). But Archival disc, that has only 3 layers but 500 GB capacity per side? One sided discs are only in use now? So 1 TB is capacity of 12 cm two sided disc. Only three layers, if they are made like DVD RAM to last 100 000 write / erase cycles, or even (much) less, it will be cheap data storage if mass produced like DVD discs (used like DVD RAM). If optical disc / optical tape has more write / erase cycles than magnetic tape (LTO) and/or cheaper price per gigabyte it can replace magnetic tape data store. If it has same amount of write/erase cycles, or even less, it can still replace magnetic tape store.

There is mistakes in text above: Archival disc, if it has 500 GB per side (two sided disc is then 1 TB), has five layers, not three. 30 cm diameter optical disc, if it is two sided, and 2 X 400 GB capacity, has 5 TB not 10 TB capacity. 200 platters are then needed to make petabyte optical store hard disc drive. if Archival disc format is used (1 TB) then 160 platters is enough. If disc is inside protective plastic shell that looks like Sony UMD disc, but completely closed shell against dust, less error correction can be used. If error correction makes data 2,5 times more than without it, then just 80 or 64 platters are enough for petabyte optical hard drive. Each PC can have it, although it must separate from PC because this 30 cm disc hard drive is bigger than PC itself. But it is cheap. Also 200 disc hard drive does not need 100 laser pickups but 200 because discs are two sided. But DVD / Bluray laser pickups are cheap. It would even be possible that these large optical discs, 30 cm / 12 inch and 96 cm / 38 inch can be used for ROM data distribution. Because discs are individual in optical hard drive platter “tree”, and can be replaced individually from “tree”, each disc inside its own plastic protective shell, one disc that contains either 5 TB (30 cm disc), or over 50 TB (96 cm disc) if they are without protective casing, or about 2,5 times more with plastic shell, 12,5 TB with 30 cm disc and 128 TB in 96 cm disc, those discs can be used as ROM distribution, like DVD ROM, but with hugely increased capacity. Manufacturing price is few dollars or even less than one dollar in 30 cm disc. If Archival disc format is used and protective shell then 160 TB is available in 96 cm disc and about 16 TB in 30 cm disc. Those optical discs have large capacity but very low price compared to magnetic IC memory. For example high definition 3D movies made with virtual reality almost 360 degree cameras can be distributed using 30 cm optical disc, there was earlier Laserdisc format for film distribution, disc was same size. This one disc can be put to “tree” of 64 platter optical hard drive, among other platters (discs), and taken away if needed and replaced with another. Optical disc scales upwards very cheaply, the more capacity (bigger) disc is the more cheaper it is to make if gigabyte / dollar is counted, and those 30 cm or 96 cm discs have extremely low price compared to magnetic IC memory. Magnetic tape memory is also cheap if manufactured in mass production like VHS cassettes. If there is optical tape format, that would be really high capacity, cheap and dense data store. Holographic tape? Holographic tape can also be used as holographic film, storing holographic movies that can be shown using projector that is sold to every home with silver screen. So holographic tape can be used as data store but also as holographic film distribution like old 16 mm films were distributed to home film viewing. Holographic movie needs laser light so scenes filmed outdoors in sunlight are filmed in regular stereoscopic 3D but when filmed indoors laser light can be used for real holographic effect.