# DVD block size (in bytes)

#1

Hi everybody

I need to know what is the block size (in bytes) in data DVD?
I know that block size in data CD is 2048 Byte/block. Is it the same for data DVD?

#2

Hello!

There are 16 sectors in one DVD data Block.
one sector is construted by 2048 bytes(only data).
So one DVD data block size is 2048*16 bytes(=32768 bytes)

#3

hello blueoled

thank you for reply

when i insert new DVD into burner i get (in CDInfo) that FreeCapacityInBlocks = 2295104 what said that there is 2295104 free blocks.
you wrote me:

There are 16 sectors in one DVD data Block.
one sector is construted by 2048 bytes(only data).

so 2295104 blocks should be 2295104 * 16 * 2048 = 75205967872 bytes
what should be 75205967872/1024/1024/1024 = 70GB and it’s not right!!!

I calculate every block as 2048 bytes so I gets that that DVD capacity (in bytes) is 4.377GB what closer to the right capacity (4.7GB) but it’s not correctly yet. I’m still looking for the right size

#4

Dear yoss05:

I told you the definition of data block is from DVD-Rom specifications.
So the block you got is the sector of DVD-ROM.
I think the block size is 2048 Byte.

You got the freeblock is 2295104
so 2295104 blocks should be 2295104 * 2048 = 4700372992 bytes
The capacity of DVD is about 4.7 Gbytes (1Gbytes=1000000000 bytes for decimal)

The other result is 4.377 Gbytes (1Gbytes=1073741824 bytes for computer)
4700372992/1073741824=4.377 G
4700372992/1048576=4482.6 M (you can see this result from Nero Disc info)

For computer
K=1024
M=10241024=1048576
G=1024
1024*1024=1073741824

#5

Hi Blueoled,

Thanks for clearing that up - your initial description was different:

“one DVD data block size is 2048*16 bytes(=32768 bytes)”

Thanks

Mike