Comments on: Truth About Serial ATA and PCI-E http://jacobsantos.com/2006/computers/truth-about-serial-ata-and-pci-e/ Rumblings, rants, essays, stories by Jacob Santos about Web Site Development, Persistent Browser-Based Games, personal journal, and Programming. Mon, 21 May 2012 13:04:07 +0000 hourly 1 http://wordpress.org/?v=3.3-aortic-dissection By: Jacob Santos http://jacobsantos.com/2006/computers/truth-about-serial-ata-and-pci-e/comment-page-1/#comment-33132 Jacob Santos Sat, 24 May 2008 02:55:18 +0000 http://www.santosj.name/?p=260#comment-33132 @mac I believe I understood at one point that there was a the internal speed differences and the interface speed. However, without the interface speed being able to push the bandwidth they there is no incentive for hard drive manufactures to increase the internal performance. @mac

I believe I understood at one point that there was a the internal speed differences and the interface speed. However, without the interface speed being able to push the bandwidth they there is no incentive for hard drive manufactures to increase the internal performance.

]]> By: mac http://jacobsantos.com/2006/computers/truth-about-serial-ata-and-pci-e/comment-page-1/#comment-33131 mac Sat, 24 May 2008 01:39:27 +0000 http://www.santosj.name/?p=260#comment-33131 better late than never... this looks to be an article written in 2006 ? I'm replying mid 2008. It's interesting to see the focus of this write up about the speed of a hdd actually focused on the speed of the "interface" that connects the hdd to the motherboard. The actual maths associated with the interface, lead you to believe the interface actually determinds the speed difference of the hdd. I'm sorry to say the interface whether it be ide, ata, sata, does not determine the internal capabilities of the actual hdd speed. Recently in 2008 hdd speeds topped 100mb/s internal capabilities, so whether your using a ata 133, sata 150, 300 is irrelevant. The speed at which data is moved thru this really big pipe (interface) is not determinded by the connector or interface capability, it's determinded by the internal capabilities of the hdd's components. The truth that the hdd advertised as ata 133 or sata 150 being "faster", is in fact incorrect and was when you wrote this article. A hdd using a 133 or 150 interface would transfer data at exactly the same speed is true. The truth of the matter is that hdd advertising has for a very long time been focused on the interface speed capabilities and not the speed at which a hdd factually transfers data. It's alittle unfortunate that this has occured as hdd speeds have increased very little in the past 5-10 years due to this. In 2002 when i built my computer the speed of my hdd was approx 40mb/s. I have installed 5 other hdd to my system over the last 6yrs, and the best speed one is running in the 60-70mb/s. Maybe if the focus of hdd's was restored to it's actual capabilities of moving data instead of the interface max speed, then we might see some larger improvements in hdd. better late than never…
this looks to be an article written in 2006 ?
I’m replying mid 2008.

It’s interesting to see the focus of this write up about the
speed of a hdd actually focused on the speed of the "interface" that
connects the hdd to the motherboard.
The actual maths associated with the interface, lead you to believe the
interface actually determinds the speed difference of the hdd.
I’m sorry to say the interface whether it be ide, ata, sata, does not determine the internal capabilities of the actual hdd speed.
Recently in 2008 hdd speeds topped 100mb/s internal capabilities, so whether your using a ata 133, sata 150, 300 is irrelevant.
The speed at which data is moved thru this really big pipe (interface) is
not determinded by the connector or interface capability, it’s determinded by the internal capabilities of the hdd’s components.

The truth that the hdd advertised as ata 133 or sata 150 being "faster", is in fact incorrect and was when you wrote this article.
A hdd using a 133 or 150 interface would transfer data at exactly the same speed is true.

The truth of the matter is that hdd advertising has for a very long time been focused on the interface speed capabilities and not the speed at which a hdd factually transfers data.

It’s alittle unfortunate that this has occured as hdd speeds have increased very little in the past 5-10 years due to this.
In 2002 when i built my computer the speed of my hdd was approx 40mb/s.
I have installed 5 other hdd to my system over the last 6yrs, and the best speed one is running in the 60-70mb/s.

Maybe if the focus of hdd’s was restored to it’s actual capabilities of moving data instead of the interface max speed, then we might see some larger improvements in hdd.

]]> By: Shane http://jacobsantos.com/2006/computers/truth-about-serial-ata-and-pci-e/comment-page-1/#comment-40 Shane Fri, 04 Aug 2006 06:41:44 +0000 http://www.santosj.name/?p=260#comment-40 Nice article, however your math sucks, you're removing the 2 of 10 bit overhead twice. Assuming that the numbers given by the SATA standard are using M and G in the Si usage (1000 not 1024, which will give us lower numbers anyway, 1.5Gb/s = 1500Mb/s) then your math should be: 1500Mb/s * 8_data_bits/10_actual_bits = 1200 data_bits/s 1200 data_bits/s / 8 b/B = 150B/s You do "lose" speed due to the overhead, but that pulls the speed from the actual 188B/s to the effective 150B/s. Nice article, however your math sucks, you’re removing the 2 of 10 bit overhead twice. Assuming that the numbers given by the SATA standard are using M and G in the Si usage (1000 not 1024, which will give us lower numbers anyway, 1.5Gb/s = 1500Mb/s) then your math should be:

1500Mb/s * 8_data_bits/10_actual_bits = 1200 data_bits/s
1200 data_bits/s / 8 b/B = 150B/s

You do “lose” speed due to the overhead, but that pulls the speed from the actual 188B/s to the effective 150B/s.

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