Why when 2 analogous models of SSD are offered, from which one is SATA
and the second is IDE, then they so significantly differ in speed
although their price is identical?

For instace Transcend:

1.) IDE (PATA)
TS32GSSD25-M
Read up to 66MB/s, Write up to 47MB/s (32GB)
http://www.memoryc.com/storage/solid...ternalssd.html

2.) SATA
TS32GSSD25S-M
Read up to 150MB/s, Write up to 90MB/s
http://www.memoryc.com/storage/solid...gbsatassd.html

How to explain this? If they really were identical inside then just
IDE interface limited a transfer rate for IDE so the (PATA) numbers
rather should be:
Read 100MB/sec, Write up to 90MB/sec

------
If somebody have doubts about the source of these specs then voila -
there similar numbers on Transcend site:

The same models of SSD - with the exception of interaface:

1.) IDE http://tinyurl.com/ks4n9t
Performance:
SLC - Read up to 74MB/s, Write up to 62MB/s (8GB to 32GB)
Read up to 80MB/s, Write up to 70MB/s (64GB)
MLC - Read up to 74MB/s, Write up to 45MB/s (32GB, 64GB)
Read up to 68MB/s, Write up to 46MB/s (128GB)

2.) SATA http://tinyurl.com/loawg2
Performance:
SLC - Read up to 150MB/s, Write up to 90MB/s (8GB)
Read up to 150MB/s, Write up to 100MB/s (16GB)
Read up to 150MB/s, Write up to 120MB/s (32GB)
Read up to 170MB/s, Write up to 140MB/s (64GB)
MLC - Read up to 150MB/s, Write up to 50MB/s (16GB)
Read up to 150MB/s, Write up to 90MB/s (32GB to 192GB)

Simply THE SAME but 2 times faster than IDE (PATA), how does the name-
brand Transcend justify this *dishonest* difference?

Alojzy Zakalec <alojzy.zakalec******.com> wrote in news:d632d9b6-612f-41ff-
bc29-db644d25d586@v20g2000yqm.googlegroups.com:

> Why when 2 analogous models of SSD are offered, from which one is SATA
> and the second is IDE, then they so significantly differ in speed
> although their price is identical?
>
>

Internal data rate
960 to 1607
Mbits/sec (variable with zone)

Here's the internal data rate of my Seagate 15000 RPM SCSI drives in my
Poweredge.

But, reality is nowhere near this rate because of the cache and interface
and prefetch going on trying to anticipate what the processors are going to
fetch next. Sure is impressive, though...(c;]

How fast the SSD's memory can read or write isn't the issue. Getting the
data to and from that memory is the differences you're seeing. It's all
about interface.

--
Larry

In a laptop, what are you worrying about, a few seconds? Sit back, relax
and watch the pretty lights kerblinking.

On 2 Sie, 16:03, Larry <no...@home.com> wrote:
> How fast the SSD's memory can read or write isn't the issue. *Getting the
> data to and from that memory is the differences you're seeing. *It's all
> about interface.

Exactly what I've just meant! It's all about interface! But the point
is the IDE (PATA) interface's limit is 100MB/s (133MB/s for ATA130)
and when all SSD logic, everything what is behind interface (flash-
NANDs + controler + cache) has capability of SUSTAINED transfer rate
which far exceeds this 100MB/s (what is observed in the SATA version)
then we should see at least this IDE (PATA) limit, simple as that!

Alojzy Zakalec <alojzy.zakalec******.com> wrote in news:7a5d3a5e-af70-4c9f-
a54f-28c6941e8dff@c14g2000yqm.googlegroups.com:

> On 2 Sie, 16:03, Larry <no...@home.com> wrote:
>> How fast the SSD's memory can read or write isn't the issue. *Getting t
> he
>> data to and from that memory is the differences you're seeing. *It's al
> l
>> about interface.
>
> Exactly what I've just meant! It's all about interface! But the point
> is the IDE (PATA) interface's limit is 100MB/s (133MB/s for ATA130)
> and when all SSD logic, everything what is behind interface (flash-
> NANDs + controler + cache) has capability of SUSTAINED transfer rate
> which far exceeds this 100MB/s (what is observed in the SATA version)
> then we should see at least this IDE (PATA) limit, simple as that!
>
>

We ARE talking about a simple little XPSP3 laptop with a 533 Mhz bus speed.
I'd think some superspeed drive operating into a 533 Mhz motherboard you
might just run afoul of something having to wait at 100 MB/s or more. Disk
access isn't all the bus has to contend with while transferring data.

Traffic jams on the motherboard would also limit how fast the data could
get to the memory....especially when it's also decoding and rendering a
DivX movie simultaneously, or something like that.

--
Larry

http://flightaware.com/analysis/allflights_movie.rvt
Each tiny red dot is an airliner in this Quicktime movie, ONE recent day of
air travel in the USA. What would happen if "they" found out this was the
real source of air pollution or cancer or why all the bugs around my
streetlight have disappeared? Would "they" tell us? Would "they" STOP
IT?!

Alojzy Zakalec <alojzy.zakalec******.com> wrote in news:7a5d3a5e-af70-4c9f-
a54f-28c6941e8dff@c14g2000yqm.googlegroups.com:

> On 2 Sie, 16:03, Larry <no...@home.com> wrote:
>> How fast the SSD's memory can read or write isn't the issue. *Getting t
> he
>> data to and from that memory is the differences you're seeing. *It's al
> l
>> about interface.
>
> Exactly what I've just meant! It's all about interface! But the point
> is the IDE (PATA) interface's limit is 100MB/s (133MB/s for ATA130)
> and when all SSD logic, everything what is behind interface (flash-
> NANDs + controler + cache) has capability of SUSTAINED transfer rate
> which far exceeds this 100MB/s (what is observed in the SATA version)
> then we should see at least this IDE (PATA) limit, simple as that!
>
>

http://www.sammynetbook.com/tag-bus-speed.html

oops....sorry.

--
Larry

http://flightaware.com/analysis/allflights_movie.rvt
Each tiny red dot is an airliner in this Quicktime movie, ONE recent day of
air travel in the USA. What would happen if "they" found out this was the
real source of air pollution or cancer or why all the bugs around my
streetlight have disappeared? Would "they" tell us? Would "they" STOP
IT?!

On 3 Sie, 04:06, Larry <no...@home.com> wrote:
> Alojzy Zakalec <alojzy.zaka...******.com> wrote in news:7a5d3a5e-af70-4c9f-
> a54f-28c6941e8...@c14g2000yqm.googlegroups.com:
>
> > On 2 Sie, 16:03, Larry <no...@home.com> wrote:
> >> How fast the SSD's memory can read or write isn't the issue. *Getting t
> > he
> >> data to and from that memory is the differences you're seeing. *It'sal
> > l
> >> about interface.
>
> > Exactly what I've just meant! It's all about interface! But the point
> > is the IDE (PATA) interface's limit is 100MB/s (133MB/s for ATA130)
> > and when all SSD logic, everything what is behind interface (flash-
> > NANDs + controler + cache) has capability of SUSTAINED transfer rate
> > which far exceeds this 100MB/s (what is observed in the SATA version)
> > then we should see at least this IDE (PATA) limit, simple as that!
>
> We ARE talking about a simple little XPSP3 laptop with a 533 Mhz bus speed. *
> I'd think some superspeed drive operating into a 533 Mhz motherboard you
> might just run afoul of something having to wait at 100 MB/s or more. *Disk
> access isn't all the bus has to contend with while transferring data.

Wrong! as far as my laptop is concerned there is express PCI with ~4GB/
s trhoughput, it also has capability to run SATA but producent, I
don't know why, has implemented PATA channel in the mainboard.

> Traffic jams on the motherboard would also limit how fast the data could
> get to the memory....especially when it's also decoding and rendering a
> DivX movie simultaneously, or something like that.

Besides, in pure PATA architectures IDE channels are not conducted via
PCI, don't they?

Alojzy Zakalec <alojzy.zakalec******.com> wrote in news:05165111-496d-44c7-
bcd4-4a9e05e4f711@d32g2000yqh.googlegroups.com:

> Wrong! as far as my laptop is concerned there is express PCI with ~4GB/
> s trhoughput, it also has capability to run SATA but producent, I
> don't know why, has implemented PATA channel in the mainboard.
>
>

I don't care if your SSD has a transfer rate of 50TB/ms, it isn't going
anywhere plugged into a 533 Mhz motherboard bus that has better things to
do....

--
Larry

http://flightaware.com/analysis/allflights_movie.rvt
Each tiny red dot is an airliner in this Quicktime movie, ONE recent day of
air travel in the USA. What would happen if "they" found out this was the
real source of air pollution or cancer or why all the bugs around my
streetlight have disappeared? Would "they" tell us? Would "they" STOP
IT?!