Original PlayStation games have black undersides because Sony used a special black-tinted plastic when manufacturing the discs.
Despite their unusual appearance, they're just standard CDs. The black colour was mainly a way to give PlayStation games a distinctive look and make genuine discs easier to recognise.
The black colour isn't what prevents copied games from working. The PS1 uses a separate copy protection system.
Why did Sony make PS1 discs black?
When Sony launched the original PlayStation in 1994, it wanted its games to stand out.
Unlike Nintendo's cartridge-based consoles, the PlayStation used CDs. But rather than using the familiar silver discs you'd find in a music collection, Sony gave its games a distinctive black underside.
It made PlayStation games instantly recognisable, even without their cases.
The colour also helped distinguish genuine PlayStation discs from ordinary recordable CDs, which were commonly used for copied games.
But the black plastic wasn't actually a security feature in itself.
Are black PS1 discs different from normal CDs?
Not really.
Underneath the black tint, PS1 discs use the same basic CD-ROM technology as ordinary CDs.
The discs contain data that the PlayStation reads using its optical drive, just like a computer reading a CD-ROM.
The black appearance comes from dye in the plastic, rather than a special coating or an entirely different type of disc.
And despite how dark they look, the discs still allow the laser to read the data.
Does the black colour prevent piracy?
No.
This is a common misconception.
The PS1 does have copy protection, but it doesn't work by checking whether the disc is black.
Instead, genuine PlayStation discs contain special information in the disc's physical structure that ordinary CD writers couldn't reproduce.
This includes the region and authentication information used by the console to check whether a disc is genuine.
That's why simply copying a PS1 game onto a black CD-R won't make it work on an unmodified PlayStation.
The colour has nothing to do with it.
Why are some PS1 discs silver instead?
If you've come across a PS1 disc with a silver underside, there are a few possible explanations.
The most common is that you're looking at a demo disc, promotional disc or unofficial copy.
Most standard retail PS1 games used black discs, but there were exceptions, particularly with promotional releases.
Some demo discs also used the familiar black plastic, so colour alone isn't enough to determine whether a disc is genuine.
If you're buying a PS1 game second-hand, it's worth checking the disc artwork, printed catalogue number and overall appearance rather than relying entirely on the underside.
Can the PS2 play black PS1 discs?
Yes!
The PlayStation 2 is backwards compatible with the vast majority of original PlayStation games.
That includes the familiar black discs.
You can put an original PS1 game into a PS2 and play it without any modifications, provided the game is compatible and from the correct region.
You'll also need a PS1 Memory Card if you want to save your progress. A standard PS2 Memory Card won't work for saving PS1 games directly.
Are black PS1 discs more valuable?
No, not because of their colour.
Black discs were standard for original PlayStation games, so there's nothing particularly rare about them.
The value of a PS1 game comes down to the title, region, edition, condition and whether it's complete with its original case and manual.
A common game on a black disc is still a common game.
And a rare game doesn't become any less valuable just because its disc looks like every other PS1 disc.
Why didn't Sony keep using black discs?
When Sony launched the PlayStation 2 in 2000, it moved primarily to DVDs.
Most PS2 games have silver undersides, while games released on CD-ROM have blue undersides.
The PS3 then moved to Blu-ray discs, which also have a different appearance.
So the black discs remain one of the original PlayStation's most recognisable features.
It's a small detail, but one we love about collecting PS1 games. There's something quite satisfying about opening an old PlayStation case and finding that distinctive black disc inside.