Re: RAID Sizes (was Re: Why do people in the UK put a u in the word color?)
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
smal
> 'm' is 0.001 (1/1000).
So what do you propose as a solution ??
Maybe I'm dense, but;
kb = kilobit
KB = KiloByte
mb = megabit
MB = MegaByte
1 bit * 8 = 1 byte
1 Byte / 8 = 1 bit
This is even more of a hot button issue since the advent of SATA and
PCI-Express and Serial signaling rates across interfaces. E.g.;
Serial ATA (SATA) data transfer rate specification = 1500 *mbps* or
*mb/sec* (megabits per second). 1500 / 8 = 187.5 *MBps* or *MB/sec* -
but since 8/10b encoding is used, the actual data transfer rate drops
20% - so the "nominal/useful" rate ends up being 150 *MB/sec*
....now, if you look up - you'll notice 150MB and 1500mb (which are
both correct) - and SATA II specs (while not yet set in stone) are
300MB and 3000mbps. This also appears incorrect since 3000mbps / 8 =
375MBps (not 300), but many people do NOT account for the 8/10b
encoding conversion, so they end up writing ALL sorts of differing
specs about Transfer rates (the big Tel-Co(s) are great at this game).
> > If you bought a 1,000,000 Byte (1MB) HDD - you'd lose 48
*KiloBytes*
> > If you bought a 1,000,000,000 Byte (1GB) HDD - you'd lose 73
> > *MegaBytes*
> > If you bought a 1,000,000,000,000 Byte (1TB) HDD - you'd lose 99
> > *GigaBytes*
>
> 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.
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