[G4] Drives?

[John Niven]

Doug,

you didn't answer the question. So explain to us why
you think 1.5Gb/s is the same as 150Mb/s ?

Since the industry chooses to specify SATA drives that
way, I thought it would less confussing to use the
marketing terms you see on the package.

John

--- Doug Burton <slugg0 at embarqmail.com> wrote:

> 
> On Jan 31, 2008, at 11:47 AM, John Niven wrote:
> 
> > Doug,
> > What are you defining as a Mb?
> >
> > There is a difference between Mbytes and Mbits. A
> byte
> > is 8 bits.
> >
> > So in theory 133Mbytes per second is equivalent to
> > 1064Mbits per second (=1.064Gbits per second).
> This is
> > less than 1.5Gbits but there are overheads in the
> bit
> > coding which mean that these two numbers are not
> > exactly equivalent. THAT's why it's confusing!
> >
> > I had read that in practice ATA133 ~= SATA150.
> >
> > Anyway I would rather use SATA because of the
> better
> > cabling and airflow, never mind the speed.
> >
> > John
> >
> > --- Doug Burton <slugg0 at embarqmail.com> wrote:
> >
> >>> ATA133 = 133Mbytes per second.
> >>> SATA = 1.5Gbits per second.
> >>
> >> I find this a bit misleading in that you state
> the
> >> drive speeds in two
> >> different formats.  Why not just tell it like it
> is
> >> and say:
> >>
> >> ATA133 = 133 Mb per second
> >> SATA = 150 Mb per second
> 
> Exactly why I said it was confusing to state PATA as
> Mbytes and SATA  
> as Gbits.  When you look at the true speed
> difference you should state  
> the terms in the same format, Mbytes to Mbytes or
> Gbits to Gbits.   
> Your statement following the speed stats, "I believe
> these two are  
> comparable in throughput.", was indeed correct.
> 
> And yes the true advantage to using SATA (150)
> drives is the cabling.   
> Now when you move up to SATA (300) or SATA II as
> it's sometimes  
> referred to, the speed is a greater factor. 
> Unfortunately I don't  
> know of any Mac interface cards available for this
> faster SATA  
> standard yet.
> 
> Just a message from Doug...
> 
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