Sunday, April 12, 2009

Actual Size of a DVD

A month ago, was tryin to burn a DVD to its maximum extent. Had a Sony DVD which claims its capacity to be 4.7GB. But when I tried burning data worth 4.7GB it said, please insert a disk with 4.7GB of capacity.

I kept on reducing it by 100 MB i.e., 4.6GB, 4.5GB but in vain.even 4.4 GB didnt work. Also, it was giving me confused error messages about DVD+R and DVD-R formats.

After a bit of googling, I found that the 4.7 GB of a DVD disk is actually 4.7 * 10^30. That boils down to 4.3 * 2^30 i.e., 4.3 GiB. When i reduced it to 4.3GB, everything went well. Just thought of sharing this info so that you don't face it further. =)

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3 Comments:

Blogger Manoj said...

The problem arises due to the values of 1 GB considered by different hardware manufactures and the OS.
An OS considers 1 GB =1073741824 bytes whereas the DVD manufacturers take 1 GB = 1000000000 bytes. This problem also arises in HDD. You buy a 80 GB HDD and the OS shows only ~74 GB.

9:02 PM  
Blogger Sandesh said...

Thats the reason why they differentiate GB and GiB, GB is used for 10 power 30 values, GiB is used for 2power 30 values.

9:22 PM  
Blogger i 7 said...

oLLe adviseu. dengya for yur adviseu.

8:47 PM  

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