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Guiding Light on 25 April 2009
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NJ5 said:
Slimebeast said:
MikeB said:
@ Slimebeast

Blu-ray duble layer discs have 45GB effective storage availabe for games, right?


Where did you get this from?

 

 I dunno, I think I saw the number 45Gb and Bluray mentioned in the thread, perhaps it was NJ5, so  I assumed that was a reference to the effective storage space on double layer Blurays.

What's the right number then? The number we can compare to the 6.8GB for DVD9?

No, it was not me. I don't have any idea what's the usable space in a dual-layer BD disc.

It doesn't seem dual-layer BD performance is too great though, as evidenced by the fact that MGS4 has HD installs.

 

45GB is the available storage for data on a Bluray disc, be it video, or data or whatever. A single layer disc can hold 23.3GB. If you relate this back to DVD where a single layer can hold 4.37GB and a double layer 7.95GB. There's always going to be some overhead and you won't get TWICE the storage on a double layer, since extra error correction blocks are needed due to the extra layer and it being harder to read. I'm not sure how much of that 45GB the PS3 uses for other stuff, not a lot I wouldn't think.

The comparison to the 6.9 GB available for the 360 is pointless. What are we comparing exactly? We all know that long games like RPGs will be spread over multiple discs. No other games have suffered due to the 6.8GB available. Swapping discs in RPGs has never bothered anyone who actually has done it. Only the people who like to make the PS3 look better by declaring it a problem.

 

The PS3 reads dual layer BD media at 2x - same as single layer. It's only in modern drives that reading is affected. For example my LG GGW-H20L can read at a maximum of 6x. It does it through CAV. So it starts at around 2.6x-6x-back down 2.6x on a dual layer disc.

 

 It's called a BD25\BD50 for the same reasons as a DVD is called a DVD5\DVD9.

It's the number of gb available using BINARY counting, where a kb = 1000 bytes. In reality its 1024 bytes + filesystem overhead. Same when you buy a hard drive and it is sold to you as 500GB but it is actually 465GB