Re: RAID Sizes (was Re: Why do people in the UK put a u in the word color?)
On 18.04.06 05:31, Willie Wonka wrote:
> Matus UHLAR - fantomas wrote:
> > On 16.04.06 22:56, Willie Wonka wrote:
> > > Explained another way (hopefully);
> > > If you bought a 1,000 Byte (1KB) HDD - you'd lose 24 *Bytes*
> >
> > No. The big 'K' stands for 1024, 1000 is small 'k'.
> > The big 'K' was chosen exactly to differ 1024 from 1000 - small 'k'.
> >
> > But this can't be applied for 'M' because big 'M' is 1 000 000, while
> > small 'm' is 0.001 (1/1000).
> So what do you propose as a solution ??
solution? strictly differ between decadic and binary prefixes, so use
k for 1000, M for 1000000, G for 1000000000, while
Ki for 1024, Mi for 1048576, Gi for 1073741824
so if a HDD manufacturer speaks about 20GB HDD, count it as 20 000 000 000
B, so you won't be surprised it is not 20 GiB.
> Maybe I'm dense, but;
> kb = kilobit
= 1000 b
> KB = KiloByte
= 1024 B
> mb = megabit
nope, small 'm' snands for 'mili' which is 1/1 000 000 e.g. one millionth
part.
> MB = MegaByte
megaByte, actually 1000000B, but is ocasionally used
> 1 bit * 8 = 1 byte
> 1 Byte / 8 = 1 bit
yes, usually. the Byte was first defined as the smallest amount of data a
CPU can ordinadily work with. currently, it's being used as "8 bit", however
there were compurers that used e.g. 9-bit Byte.
> Serial ATA (SATA) data transfer rate specification = 1500 *mbps* or
> *mb/sec* (megabits per second). 1500 / 8 = 187.5 *MBps* or *MB/sec* -
as I again say, small 'm' means 'mili' so it's not correct
> > Luckily, HDD manufacturers count with KB/KiB (1024B)'s, so 10GB HDD was
> > counted as 1 000 000 KB - 1 024 000 000 Bytes. This was because HDD's
> > use 512B sectors, and it's easier to divide number of sectors by 2 than
> > to multiply it by 512.
>
> Luckily ? I think not....
> Why would I want to divide sectors anyway.
what I meant, was that it would be even worse if they multiplied number of
sectors by 512 and divide by 1000 to get some more of "fake" capacity...
--
Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
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