[X4U] External HD: 750 gig to 699 when formatted. Why???

[..lj]

On Jun 24, 2009, at 11:47, Michael Winter wrote:

>
> On Jun 11, 2009, at 9:06 PM, Randy B. Singer wrote:
>> A 750GB drive should have a 55,500MB loss when formatted, for a  
>> total formatted size of about 694.6GB.  You got off easy.
>
> That seemed like it was still a bit high for "lost space", so I just  
> had to break out the calculator.
> 750,000,000,000 bytes, divide by 1024 yields
> 732,421,800 kB, divide by 1024 gives
> 715,256 MB, divide one more time by 1024 equals
> 698.5 GB.
>
> So much for what "seemed right" to me. I was guessing it should have  
> been ~710.
>
> -Mike
> _______________________________________________
A 750 gByte drive only gives you a formated 699 gByte. Internally the  
computer is based on 1024 while the box list a number based on 1000.  
Therefore the computer formated number goes like this.

1 gByte = 1024 mByte
1 mByte = 1024 kBytes
1 kByte = 1024 Bytes.

So 699 gBytes(1024 based) = 699 * 1024 * 1024 * 1024 = 750 gBytes  
(1000 based) in marketing speak.
..lj