blu ray real capacity

[xlr8]

hi

i have a question about the real capacity of blu ray discs

the faq says it is 25 gb, but it is not clear, there is big confusion about what is a gb, if 1024^3 or 1000^3, and obviously, in fact, the blu ray disc capacity measured from software is not any of the two

it seems i can not record more than approx 24,220,000,000 bytes

i expected it was 25 billions exactly, not so less

in fact dvds are told 4.7 gb and they are 4,700,000,000

so, it is me having problems or it is true blu ray discs can store only 24 billions and few more bytes?

my system xp sp3, writer lg ggw h20l with latest firmware
programs tried: nero 8, ashampo burning studio 8, imgburn 2.4

thx

[dadkins]

My Vista laptop shows 4.38GB for a Blank DVD-R.

There is always(it seems) a variance in size...



Sorry, no BD blanks.

[ryoohki]

Originally Posted by xlr8

hi

i have a question about the real capacity of blu ray discs

the faq says it is 25 gb, but it is not clear, there is big confusion about what is a gb, if 1024^3 or 1000^3, and obviously, in fact, the blu ray disc capacity measured from software is not any of the two

it seems i can not record more than approx 24,220,000,000 bytes

i expected it was 25 billions exactly, not so less

in fact dvds are told 4.7 gb and they are 4,700,000,000

so, it is me having problems or it is true blu ray discs can store only 24 billions and few more bytes?

my system xp sp3, writer lg ggw h20l with latest firmware
programs tried: nero 8, ashampo burning studio 8, imgburn 2.4

thx

The disc is 25gig.. but you have to account the file system. The same way that a 250gig HDD is list 238gig when formatted. The drive is 250gig for real but once the file system in on the disc it... since goes away for it..

and blank DVD's are 4.38gig (4.7gig)

[McBain]

Originally Posted by xlr8

hi

i have a question about the real capacity of blu ray discs

the faq says it is 25 gb, but it is not clear, there is big confusion about what is a gb, if 1024^3 or 1000^3, and obviously, in fact, the blu ray disc capacity measured from software is not any of the two

it seems i can not record more than approx 24,220,000,000 bytes

i expected it was 25 billions exactly, not so less

in fact dvds are told 4.7 gb and they are 4,700,000,000

so, it is me having problems or it is true blu ray discs can store only 24 billions and few more bytes?

my system xp sp3, writer lg ggw h20l with latest firmware
programs tried: nero 8, ashampo burning studio 8, imgburn 2.4

thx

Blu-ray capacity: http://www.emedialive.com/articles/r...leid=11420#ivb

[guitarist155]

capacity of hard drives and disks is sadly used as a marketing tool.

one gig is = 1024 MB
but is rounded to 1000 for marketing yet 1gb will still take up 1024mb
so you lose 24mb per gig when you look at what is really space vs what your told. so on a 25 gig disk you would lose 600mb, now mb also meet the same demise so they are rounded to 1000 from 1024 as well. so total space is not really taken up by the file structure like everyone thinks that's only a small part of it. the bigger the drive the more you lose, the file structure stays the same but the rounding gets bigger and bigger

[Midnightsailor]

Originally Posted by guitarist155

capacity of hard drives and disks is sadly used as a marketing tool.

one gig is = 1024 MB
but is rounded to 1000 for marketing yet 1gb will still take up 1024mb
so you lose 24mb per gig when you look at what is really space vs what your told. so on a 25 gig disk you would lose 600mb, now mb also meet the same demise so they are rounded to 1000 from 1024 as well. so total space is not really taken up by the file structure like everyone thinks that's only a small part of it. the bigger the drive the more you lose, the file structure stays the same but the rounding gets bigger and bigger

lol yeah...I remember being so confused when I first learned this.

[xlr8]

yes i have read your replies, but i had the doubt because when we consider 1 gb as 1,000,000,000 the size lost is already computed

so, the size should be

1. 25 * 1024^3 = old mode, and microsoft mode
2. 25 * 1000^3 = new mode

so i expected the size being exactly 25 bln bytes, knowing the dvds

instead, the size is even smaller, and the loss is not the rounding from 1024 to 1000

the sole useful info can be the link provided above, i find very strange in the whole internet (google search) it does not exist a precise amount for the "defects"

thx