Originally posted by intercept
I know what they have done, a DVD can store about 4.2 gig, not 4.7gig as quoted.
4.7 billion bits equals 4.377 GB (base 2).
With the base-two definition, a kilobyte equals 1,024 bytes; a megabyte totals 1,048,576 bytes, or 1,024 kilobytes; and a gigabyte equals 1,073,741,824 bytes, or 1,024 megabytes.
With the base-10 definition used by storage companies, a kilobyte equals 1,000 bytes, a megabyte equals 1,000,000 bytes, and a gigabyte equals 1,000,000,000 bytes. Put another way, to a disc manufacturer, a DVD that holds 4,700,000,000 bits of data holds 4.7GB; to software that uses the base-two definition, including CHKDSK, FDSIK and portions of Windows, the same drive holds 4.3 GB of data, or 4,482.27 MB.
The 'loss' to the consumer is 330.53 base-two MegaBytes.
I've just prepared another '120GB' disk which actually holds 111.759 base-two GB
When we start buying TeraByte disks the loss will be over 70,000 MB or 68 base-two GB :eek: