eSATA Cable Query

[logicearth]

I'm going to chime in with just one tidbit of information.

The internal SATA connections may be SATA 3, but not all of them. The chip set responsible for SATA will have a limited number of connections for those rated at 6gbps. Therefore they are not going to waste them on external devices, your eSATA port is most likely only capable of SATA 2 (3gbps) speeds. However, it could be SATA 3, one never knows for sure.

Granted, HDDs are barely capable of reaching SATA 1 speeds.

 

[whs]

Just for facts - I made a performance comparison eSata and USB3 using HDD, SSHD and SSD. It shows that eSata is fastest.

http://www.sevenforums.com/performa...rformance-comparison-hdd-ssd.html#post2631342

 

[Iain]

For clarification, here's the system specification of my machine:
Laptop Support - Download the latest updates for your laptop/tablet - Toshiba

It shows SSD for disk drive, but in fact there is a choice of SATA III disk drive or SSD. I chose the disk drive for reasons I've already documented elsewhere in this thread.

BTW, this machine is only a month old, so I can't see why the internal system bus wouldn't be SATA III. eSATA port is directly connected to that system bus.

EDIT: That link didn't redirect, as expected. Please enter:
W50-A-102

for model number in the lower right corner and then select "Product Specifications" tab.

 

[Lady Fitzgerald]

Just for facts - I made a performance comparison eSata and USB3 using HDD, SSHD and SSD. It shows that eSata is fastest.

http://www.sevenforums.com/performa...rformance-comparison-hdd-ssd.html#post2631342

That's on the machine you used for the test. It doesn't tell which standard is actually faster and if the cables are making a difference. Also, USB 3.0 and SATA (which includes e-SATA since they are the same except for the connectors) are different standards.

 

[Iain]

I'm going to chime in with just one tidbit of information.

...

Granted, HDDs are barely capable of reaching SATA 1 speeds.

Even 7200 rpm SATA III drives????????

 

[Lady Fitzgerald]

For clarification, here's the system specification of my machine:
Laptop Support - Download the latest updates for your laptop/tablet - Toshiba...

That link still doesn't tell us anything.

...I chose the disk drive for reasons I've already documented elsewhere in this thread...

Which were completely invalid reasons based on erroneous assumptions. The notebook I'm typing this on uses a lone SSD (500GB Samsung 840 EVO) and runs circles around my fastest 2.5" HDDs, my 500GB WD Blacks (7200rpm) and especially the original 500GB Seagate (5400 rpm) HDD that the notebook came with. The speed difference is so dramatic, I will never, ever own a computer again without at least an SSD boot drive.

...BTW, this machine is only a month old, so I can't see why the internal system bus wouldn't be SATA III. eSATA port is directly connected to that system bus.

You aren't paying attention. All a system needs to be to qualify as SATA III is to just be faster than SATA II. Rating a system as being SATA III doesn't necessarily mean it will run at full SATA III speeds. If SATA III port (including an e-SATA port) runs off a PCI-e lane or an add-on chip instead of being a port run off the CPU, the maximum speed you will get I only 5Gbps instead of the full 6Gbps of SATA III. Even though a bit slower, 5Gbps still meets SATA III standards. If more than one SATA port runs a single PCI-e lane or the port shares the lane with something else, such as the Wi-Fi card (yes, laptops do have separate Wi-Fi cards; they are just tiny) or Bluetooth, then the available speed will be drastically reduced. However, since the source is still SATA III, the shared port will still be considered SATA III.

Again, keep in mind that HDDs will not run as fast as the top speed of SATA II so you have nothing to "measure" the speed of a SATA III port, be it standard SATA or e-SATA.

 

[Lady Fitzgerald]

I'm going to chime in with just one tidbit of information.

...

Granted, HDDs are barely capable of reaching SATA 1 speeds.

Even 7200 rpm SATA III drives????????

Actually, 7200 rpm drives can exceed SATA I speeds but will not reach the top speed of SATA II.

 

[Iain]

For clarification, here's the system specification of my machine:
Laptop Support - Download the latest updates for your laptop/tablet - Toshiba...

That link still doesn't tell us anything.

...I chose the disk drive for reasons I've already documented elsewhere in this thread...

Which were completely invalid reasons based on erroneous assumptions. The notebook I'm typing this on uses a lone SSD (500GB Samsung 840 EVO) and runs circles around my fastest 2.5" HDDs, my 500GB WD Blacks (7200rpm) and especially the original 500GB Seagate (5400 rpm) HDD that the notebook came with. The speed difference is so dramatic, I will never, ever own a computer again without at least an SSD boot drive.

...BTW, this machine is only a month old, so I can't see why the internal system bus wouldn't be SATA III. eSATA port is directly connected to that system bus.

You aren't paying attention. All a system needs to be to qualify as SATA III is to just be faster than SATA II. Rating a system as being SATA III doesn't necessarily mean it will run at full SATA III speeds. If SATA III port (including an e-SATA port) runs off a PCI-e lane or an add-on chip instead of being a port run off the CPU, the maximum speed you will get I only 5Gbps instead of the full 6Gbps of SATA III. Even though a bit slower, 5Gbps still meets SATA III standards. If more than one SATA port runs a single PCI-e lane or the port shares the lane with something else, such as the Wi-Fi card (yes, laptops do have separate Wi-Fi cards; they are just tiny) or Bluetooth, then the available speed will be drastically reduced. However, since the source is still SATA III, the shared port will still be considered SATA III.

Again, keep in mind that HDDs will not run as fast as the top speed of SATA II so you have nothing to "measure" the speed of a SATA III port, be it standard SATA or e-SATA.

If you provide a peer-reviewed published report of this, perhaps I might believe that. Until then, your posts are simply anecdotal in nature.

BTW, read my specification post again. I've tried to ameliorate the lack of redirect by the Toshiba site.

 

[Lady Fitzgerald]

For clarification, here's the system specification of my machine:
Laptop Support - Download the latest updates for your laptop/tablet - Toshiba...

That link still doesn't tell us anything.



Which were completely invalid reasons based on erroneous assumptions. The notebook I'm typing this on uses a lone SSD (500GB Samsung 840 EVO) and runs circles around my fastest 2.5" HDDs, my 500GB WD Blacks (7200rpm) and especially the original 500GB Seagate (5400 rpm) HDD that the notebook came with. The speed difference is so dramatic, I will never, ever own a computer again without at least an SSD boot drive.

...BTW, this machine is only a month old, so I can't see why the internal system bus wouldn't be SATA III. eSATA port is directly connected to that system bus.

You aren't paying attention. All a system needs to be to qualify as SATA III is to just be faster than SATA II. Rating a system as being SATA III doesn't necessarily mean it will run at full SATA III speeds. If SATA III port (including an e-SATA port) runs off a PCI-e lane or an add-on chip instead of being a port run off the CPU, the maximum speed you will get I only 5Gbps instead of the full 6Gbps of SATA III. Even though a bit slower, 5Gbps still meets SATA III standards. If more than one SATA port runs a single PCI-e lane or the port shares the lane with something else, such as the Wi-Fi card (yes, laptops do have separate Wi-Fi cards; they are just tiny) or Bluetooth, then the available speed will be drastically reduced. However, since the source is still SATA III, the shared port will still be considered SATA III.

Again, keep in mind that HDDs will not run as fast as the top speed of SATA II so you have nothing to "measure" the speed of a SATA III port, be it standard SATA or e-SATA.

If you provide a peer-reviewed published report of this, perhaps I might believe that. Until then, your posts are simply anecdotal in nature.

BTW, read my specification post again. I've tried to ameliorate the lack of redirect by the Toshiba site.

Frankly, I've had it with you. I'm not completely ignorant and know far more about this than you obviously do, even if only based on your opinions about SSDs. Since you want to insult me, you are on your own.

 

[whs]

Jeannie well said. Don't let him get away with this crap.

 

[logicearth]

I'm going to chime in with just one tidbit of information.

...

Granted, HDDs are barely capable of reaching SATA 1 speeds.

Even 7200 rpm SATA III drives????????

Yes. The only time an HDD will even get close to SATA 2 speeds is during the initial burst when it is buffering the cache embedded on the HDD, after the cache is filled the speeds go back down to SATA 1 speeds. HDDs can not sustain SATA 2 speeds only in burst while the cache is empty. How long it stays in that burst speed depends on the amount of cache the HDD has.

That is why you normally see "16 MB" or some other value in the HDD description along with the speed, that is the amount of cache it has.

SATA 3 (or SATA 6gb/s) was made solely for SSDs while HDDs can be connected to it they will get no speed benefits from it. Other then a few new improvements in NCQ but not much more.

https://en.wikipedia.org/wiki/Serial_ATA

As of April 2010 the fastest 10,000 RPM SATA mechanical hard disk drives could transfer data at maximum (not average) rates of up to 157 MB/s, which is beyond the capabilities of the older PATA/133 specification and also exceeds a SATA 1.5 Gbit/s link.

A 10,000 RPM HDD is barely faster then a SATA 1 connection could provide.