Check your PSONE discs now! CORROSION issues!

[KH2K4]

No, that's a myth that was introduced by SONY to try and discourage people from modding their machines and playing bent CD-R's. You have to bear in mind that the PlayStation because it used CD based media was often used by some as a standalone CD player, a laser that destroyed itself for playing anything other than black discs would have led to more class action suits than you could point a shitty stick at.

As for skippy FMV, shit media burnt at maximum speed is the problem there. I raped the living shit out of my first PSX for 3 years solid with either official discs, 'golds' or VCD's and she never once skipped a beat, in fact she was better than my Saturn which was meant to play VCD's.

Wikipedia
With the early units, many gamers experienced skipping full-motion video or physical "ticking" noises coming from their PlayStations. The problem appears to have come from poorly placed vents leading to overheating in some environments the plastic moldings inside the console would warp very slightly and create knock-on effects with the laser assembly. The solution was to ensure the console was sat on a surface which dissipated heat efficiently in a well vented area, or raise the unit up slightly by propping something at its edges. A common fix for already affected consoles was to turn the PlayStation sideways or upside-down (thereby using gravity to cancel the effects of the warped interior) although some gamers smacked the lid of the PlayStation to make a game load or work.

Earliest series had potentiometers on the board for adjusting the reading mechanism, named BIAS, GAIN and an unknown one. By connecting a voltmeter between the upper-most metering point near the BIAS potentiometer and the chassis, the resulting voltage could be read. The supposed right values are 1.70 V when a CD is spinning at 1x speed and 1.85 V when a CD is spinning at 2x speed. Further tuning was also possible on the unique potentiometer present on the CD drive. Later series featured an automatic laser calibration mechanism.

It wasn't until dual shock was standard did they release a model with a slightly better quality laser taking away the parallel port in the process to stop pirates.

Then there's the fact that all ps1 cds are 71 mins not the 74 mins cd-r's of the day.

[angelwolf71885]

The narrator states that "black ink is added" which unfortunately leads me to come up with the mental image of someone squirting a fountain pen into a batch of molten plastic. They show a handful of the transparent plastic that they melt to make the disc and then show a disc having some transparent viscous fluid being applied to the top. The inner hub is clearly a black plastic but the reflective metal layer is also clearly visible.

Unless they skipped the step for adding black in the video as per being a company secret or something. The narrator did say the black was to help prevent illegal copies from being made but I don't think I've ever heard that one before.

Given CD tech was pretty much mature by the time the Playstation came along I would place my bet on whatever Sony added to make the discs black (or allow the plastic to accept the coloring agent) is what caused the oxidation. Never have I seen a CD come out like that before, even the copy of MYST I've had since 1994 or so and abused heavily as a youngling. Looks like I tried to buff it with 80 grit sand paper but nothing like what your PS1 disc looks like.

Time to scour some patents for information.

actually the black plastic you see the workers futzing with is actually a master copy made from the glass master the plastic master copy is whats really used in disk pressing they coat it witch nickel to make it durable
and use it until it spits out useless disks and then make a new plastic master copy from the glass master and rinse and repeat

i learned that from the numerous videos on youtube showing DVD and DC manufacturing also " How Its Made " helped also

[derekb]

Honestly this problem is exactly why I'm unwilling to go after any disc based systems in a hardcore collecting manner and just stick with cart systems.

[MottZilla]

It wasn't until dual shock was standard did they release a model with a slightly better quality laser taking away the parallel port in the process to stop pirates.

Then there's the fact that all ps1 cds are 71 mins not the 74 mins cd-r's of the day.

It's true that the laser was close to the power supply in older models AND the laser assembly was made of improper plastics that the heat would deform and cause problems. This was corrected in either the 500x or 700x series I think. They both moved the laser and used better materials.

PS1 CDs were not "71 minutes". They were like every CD-ROM, 74 minutes until later on when 80 minute CD-ROMs came about some games were on those I believe. CD-Rs also used to come in 74 minute capacity until 80 minutes became more common and nowdays you can only find premium archive discs that still are in 74 minute length.

Lots of rumors surround things like this. The truth is usually less dramatic than the rumors.

[KH2K4]

It's not rumour name me one ps1 game that goes past 71 mins? even the official sony software lists it as the default setting. It's just a generic cd software creation tool with PLAYSTATION presets nothing special it's probably resused code from their audio cd creation tools.

[Consumed]

You seem to be missing one salient point, namely that a 71 minute only CD would be classed as proprietary media as it would be running to a non recognized length or standard. PlayStation games come on bog-standard CD's. SONY may well possibly have imposed a limit of 71 minutes of data or code at the beginning of the machines life but that's nothing to do with disc capacity, it's just there to guarantee that the disc reads all of the media it's presented with.

[Bad_Ad84]

Its happened before - there were audio disks they had copy protection and were eventually forced to remove the "Compact Disc" branding as it violated spec.

Do PS1 disks have the Compact Disc logo? If not, then its not a proper CD. Just like Wii games arent DVD's but look the same and you can use DVDR's to copy the games.

Reference:
http://en.wikipedia.org/wiki/Compact...opy_protection

[Consumed]

Do PS1 disks have the Compact Disc logo? If not, then its not a proper CD. Just like Wii games arent DVD's but look the same and you can use DVDR's to copy the games.

Reference:
http://en.wikipedia.org/wiki/Compact...opy_protection

Yes they do, it's on the back of the packaging, in the manual and on the software/disc itself.

[Bad_Ad84]

In that case...

Although the link I posted was in 2002 (post PS1) - I would imagine if Sony were blatantly selling PS1 games with the Compact Disc logo that violated spec, Phillips would have jumped on them.

[KH2K4]

Well they used CDR-71PB also. What was maximum disc space size of 1994?

[Consumed]

650 MB or 74 minutes, that was the industry standard from the start.

[angelwolf71885]

650 MB or 74 minutes, that was the industry standard from the start.

i wonder why they bumped it to 700Mb and just kinda stopped
would of been nice if the industry kept right on trucking and maxed the CD format out at 99 mins or so

[feder]

i wonder why they bumped it to 700Mb and just kinda stopped
would of been nice if the industry kept right on trucking and maxed the CD format out at 99 mins or so

They didn't stop, in fact, there are some 99 min/870 mb CDs out there.

EDIT: DealExtreme sells them, here's a link: http://www.dealextreme.com/p/ris-99-...k-spindle-4478

[Xeauron]

They didn't stop, in fact, there are some 99 min/870 mb CDs out there.

EDIT: DealExtreme sells them, here's a link: http://www.dealextreme.com/p/ris-99-...k-spindle-4478

But don't they cause more trouble than they solve when it comes to 90's readers with a 74 min 80 min max spec as the laser would have to move beyond it's mandated zone in order to read them?

I may have missed the point of your post there by the way! So no offense...lol

[APE]

But don't they cause more trouble than they solve when it comes to 90's readers with a 74 min 80 min max spec as the laser would have to move beyond it's mandated zone in order to read them?

I may have missed the point of your post there by the way! So no offense...lol

99min discs didn't come out until well after the 74min standard was pressed into stone. They also aren't stamped with CD-ROM anywhere as far as I know.

[Xeauron]

99min discs didn't come out until well after the 74min standard was pressed into stone. They also aren't stamped with CD-ROM anywhere as far as I know.

That's pretty much what I mean, can 99min discs even be used on the likes of PSX - Saturn - Dreamcast?

[angelwolf71885]

That's pretty much what I mean, can 99min discs even be used on the likes of PSX - Saturn - Dreamcast?

i remember during the giest force talk
that if it was to large some people were gonna try and get 99 min cdr's
i think they were popular for dreamcast backups back in the day

but then again the dreamcast can read a 1.2 gig disk so not a surprise really

i am uncertain about the PSX and Saturn

[Xeauron]

i remember during the giest force talk
that if it was to large some people were gonna try and get 99 min cdr's
i think they were popular for dreamcast backups back in the day

but then again the dreamcast can read a 1.2 gig disk so not a surprise really

i am uncertain about the PSX and Saturn

Yeah, but saying that the Dreamcast native GD-R standard includes a surface that has many times more tightly coiled data rings than standard CD-R (Considering the room it has to make for the initial CD-R compat session) meaning the lens should never make it to the very outer edge.

Feel free to correct me, that's what I'm looking for. The GD-R mode on DCs would I guess also invoke a different 'read mode' to 'CD-Rs' since GD-R holds more data and uses a different diffusion pattern.

This means in reading data in CD mode it should still have a mandated 'end' to where it can comfortably read data without being instructed to 'stray'.

[angelwolf71885]

Yeah, but saying that the Dreamcast native GD-R standard includes a surface that has many times more tightly coiled data rings than standard CD-R (Considering the room it has to make for the initial CD-R compat session) meaning the lens should never make it to the very outer edge.

Feel free to correct me, that's what I'm looking for. The GD-R mode on DCs would I guess also invoke a different 'read mode' to 'CD-Rs' since GD-R holds more data and uses a different diffusion pattern.

This means in reading data in CD mode it should still have a mandated 'end' to where it can comfortably read data without being instructed to 'stray'.

well from what i understand the sessions on a GD disk are 1 mm wide give take and about 1 mm of space bumped us from 71 min to 74 min
the video posted here says 40 tracks fit in a human hair
so thats where i got about 1 mm = 50 Mb

and the few games on the dreamcast that do take up all 1.2 gig or dame near the entire thing go all the way to the outer edge

what i mean by sessions with is the space between sessions are about 1 mm wide

[Xeauron]

well from what i understand the sessions on a GD disk are 1 mm wide give take and about 1 mm of space bumped us from 71 min to 74 min
the video posted here says 40 tracks fit in a human hair
so thats where i got about 1 mm = 50 Mb

and the few games on the dreamcast that do take up all 1.2 gig or dame near the entire thing go all the way to the outer edge

what i mean by sessions with is the space between sessions are about 1 mm wide

OK time to get to the point with added juice.

I've been warned on more than several occasions that 'over burning' or the use of 99min media 'MAY' cause malfunction in the destination device if said device isn't mandated to slide or angle at such a disc as to read it's entire contents. Said warnings stated that whatever CD drive reading this could possibly make attempts to decipher unreadable sectors by hitting the edge ring (basically where it makes a shit noise because it can't go any further) and also adjusting the laser angle/power input unnecessarily.

The drive will repeat these attempts to read the unreachable sectors on the disc until the loop is broken (unlikely as it's usually infinite) or power is cut to said device.

My final point is that when you place a GD-ROM in the Dreamcast drive the data is read from the inner circle of the disc (TOC) and the drive then switches to it's second (in this example) read mode which is GD read mode utilizing the laser differently from CD mode.

Main POINT:
Obviously to read a GD-ROM fully the laser lens would have to travel no further than it would to read a full CD-ROM as the GD data grooves are in the same range as CD only packed tighter in.

Now do you know what I mean/or are suggesting?
______________________________

Also on a side note:

Oh my god! Sorry for the topic hijack!