# Decimal & Binary GB's

Um, this is not Rocket Science but someone asked (can’t find the post) why they ‘lost’ some GB’s on their new HDD.

Marketers are liars! Bits, bytes & MegaBytes are counted in 10’s when we all know that 1024KB = 1 MB, here a little conversion table

Format GB
Decimal 200.00
Binary(1024) 186.26

Decimal 180.00
Binary 167.64

Decimal 160.00
Binary 149.01

Decimal 140.00
Binary 130.39

Decimal 120.00
Binary 111.76

Decimal 100.00
Binary 93.13

Decimal 80.00
Binary 74.51

Decimal 60.00
Binary 55.88

Decimal 40.00
Binary 37.25

Decimal 20.00
Binary 18.63

Decimal 12.00
Binary 11.18

Decimal 10.00
Binary 9.31

Decimal 6.00
Binary 5.59

Decimal 2.10
Binary 1.96

Decimal 1.20
Binary 1.12

Originally posted by FutureProof
Marketers are liars! Bits, bytes & MegaBytes are counted in 10’s when we all know that 1024KB = 1 MB,

Aint this the truth. What, you don’t believe fp. Well put a blank so-called 100mb zip disk into your zip drive and then open explorer or my computer to see what the zip disk really holds (you can forget all about storing 100mb of data on it).

CD space isn’t decimal right?

Originally posted by Chewbacca
CD space isn’t decimal right?
No the OS and file structure tells you what’s on there. 1024KB = 1 MB

yes of course the FAT file system states 1024 is 1 kbyte but are 700mb cds caculated using 1000=1 kbyte or 1024=1 kbyte? I’m talking about how HDD’s are calculated using =1000 but when you format it its really =1024

hard drives are calculated using 1024k=1mb, but sold using 1000kb=1mb. cd’s, 700mb=700mb=700*1024kb, more or less

Then again, there ARE those CDs that are sold as “680MB/74Min” and “730MB/80 min”, but still only fit the normal 650/700MB. THOSE have their “box” space calculated by 1MB = 1000k = 1.000.000 bytes.

CD-R standards are minutes.

Audio gets more minutes than data because of less EDC/ECC

According to Britannica, a standard cd (i.e. 650mb/74 min) actually holds 680mb which explains why you can always overburn them to some extent. The same doesn’t hold true for 700mb/80 min cds however. Whilst some of them hold a little more than 700mb, it usually isn’t much and some actually hold slightly less.

@FutureProof: You probably meant “More MB per minute”, right? But even so, it would not equate to 680/74, more like 740/74. But yes, the standards really are the minutes, and the manufacturers print whatever they find better for them on space.

@Philamber: Odd. Somehow I doubt it… Anyway, my best overburner is a 80’ CD, my Princos, they hold an extra 04:52.60 without errors, amounting to 746MB.

Originally posted by Fallen
@Philamber: Odd. Somehow I doubt it… Anyway, my best overburner is a 80’ CD, my Princos, they hold an extra 04:52.60 without errors, amounting to 746MB.

Maybe princos give you more space than most, awful discs btw, but many 80min cds don’t have any excess capacity.