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#1
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Sata computer cable.
https://images-na.ssl-images-amazon....1Ao-pEVeYL.jpg
This one is the USB3 version, but there seems no power connection. Does the power come with the USB3? The USB2 type comes as "eSata" with a power connection: http://www.sednacomputer.com/photo/se-c-poesata-1m.jpg and I'm using this now. Can I just use the USB3 type instead? Peter |
#2
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Sata computer cable.
On 11/04/2015 08:24 PM, Peter Jason wrote:
https://images-na.ssl-images-amazon....1Ao-pEVeYL.jpg This one is the USB3 version, but there seems no power connection. Does the power come with the USB3? Yes, it is self-powered The USB2 type comes as "eSata" with a power connection: http://www.sednacomputer.com/photo/se-c-poesata-1m.jpg and I'm using this now. Can I just use the USB3 type instead? Peter |
#3
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Sata computer cable.
Peter Jason wrote:
https://images-na.ssl-images-amazon....1Ao-pEVeYL.jpg This one is the USB3 version, but there seems no power connection. Does the power come with the USB3? The USB2 type comes as "eSata" with a power connection: http://www.sednacomputer.com/photo/se-c-poesata-1m.jpg and I'm using this now. Can I just use the USB3 type instead? Peter The first cable is intended for 2.5" (5V only) laptop SATA drives. USB3 has 5V on the cable as the "bus voltage". And a hard drive can be powered from that, up to the USB3 current limit. USB3 is preferred for this, since USB3 allows a bit more current than USB2 does (from a specification point of view). And if you use this cable with a 3.5" hard drive, there would be no 12V to power the spindle motor. Inside the SATA connector end, would be a USB to SATA converter chip. But there would not be room nor power, to convert 5V to make 12V @ 3A. And while USB3 promises up to 100W in some future incarnation, I'm not sure that anyone offers a hardware solution doing that today. All we can assume is 5V at slightly less than an amp. And that's not enough to spin up a 3.5" drive. ******* The second cable is an ESATAp, with the power contacts. It depends on the characteristics of the disk controller card with the ESATA connector on it, as to what voltage or voltages are available. The lack of standards here, makes me just a bit concerned about the scheme. http://www.sednacomputer.com/product...oesata-1m.html The best reference I've been able to find in the past is this. The text says that a "12V EUHP" has both 12V and 5V on it. My guess is, the 5V comes from the USB pin section (so only a hybrid connector, and not just an ESATAp with power pins added is needed), while the P12 and P13 provide the 12V rail needed by a 3.5" drive. The number of grounds should be equal to the number of supply pins, so the ground contacts don't burn from too much current flow. P1 5V P4 GND P12 12V P13 GND http://www.addonics.com/technologies/euhp.php The early ESATAp I saw, didn't have USB contacts, and it was unclear exactly what was going on with P12 and P13. And it's important to understand that stuff, to connect compatible ESATA controller cards to enclosures and so on. While I've tried looking for this topic before on this site, I'm still not getting a strong feeling they're on top of things. I don't know who is in charge of certifying compatible solutions. When I clicked on the link to get the PDF spec, I got a 404 error. site:sata-io.org esata power So if your stuff works, great, good choice :-) If it doesn't work, I don't have a good reference for why it doesn't work. HTH, Paul |
#4
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Sata computer cable.
On Wed, 4 Nov 2015 22:09:20 -0600, philo wrote:
On 11/04/2015 08:24 PM, Peter Jason wrote: https://images-na.ssl-images-amazon....1Ao-pEVeYL.jpg This one is the USB3 version, but there seems no power connection. Does the power come with the USB3? Yes, it is self-powered Thanks, I'll get one. Very hard to find at retail outlets. The USB2 type comes as "eSata" with a power connection: http://www.sednacomputer.com/photo/se-c-poesata-1m.jpg and I'm using this now. Can I just use the USB3 type instead? Peter |
#5
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Sata computer cable.
On Wed, 04 Nov 2015 23:47:22 -0500, Paul wrote:
Peter Jason wrote: https://images-na.ssl-images-amazon....1Ao-pEVeYL.jpg This one is the USB3 version, but there seems no power connection. Does the power come with the USB3? The USB2 type comes as "eSata" with a power connection: http://www.sednacomputer.com/photo/se-c-poesata-1m.jpg and I'm using this now. Can I just use the USB3 type instead? Peter The first cable is intended for 2.5" (5V only) laptop SATA drives. USB3 has 5V on the cable as the "bus voltage". And a hard drive can be powered from that, up to the USB3 current limit. USB3 is preferred for this, since USB3 allows a bit more current than USB2 does (from a specification point of view). And if you use this cable with a 3.5" hard drive, there would be no 12V to power the spindle motor. Inside the SATA connector end, would be a USB to SATA converter chip. But there would not be room nor power, to convert 5V to make 12V @ 3A. And while USB3 promises up to 100W in some future incarnation, I'm not sure that anyone offers a hardware solution doing that today. All we can assume is 5V at slightly less than an amp. And that's not enough to spin up a 3.5" drive. ******* The second cable is an ESATAp, with the power contacts. It depends on the characteristics of the disk controller card with the ESATA connector on it, as to what voltage or voltages are available. The lack of standards here, makes me just a bit concerned about the scheme. http://www.sednacomputer.com/product...oesata-1m.html The best reference I've been able to find in the past is this. The text says that a "12V EUHP" has both 12V and 5V on it. My guess is, the 5V comes from the USB pin section (so only a hybrid connector, and not just an ESATAp with power pins added is needed), while the P12 and P13 provide the 12V rail needed by a 3.5" drive. The number of grounds should be equal to the number of supply pins, so the ground contacts don't burn from too much current flow. P1 5V P4 GND P12 12V P13 GND http://www.addonics.com/technologies/euhp.php The early ESATAp I saw, didn't have USB contacts, and it was unclear exactly what was going on with P12 and P13. And it's important to understand that stuff, to connect compatible ESATA controller cards to enclosures and so on. While I've tried looking for this topic before on this site, I'm still not getting a strong feeling they're on top of things. I don't know who is in charge of certifying compatible solutions. When I clicked on the link to get the PDF spec, I got a 404 error. site:sata-io.org esata power So if your stuff works, great, good choice :-) If it doesn't work, I don't have a good reference for why it doesn't work. HTH, Paul I have been using one of the eSata USB2 cables for about 3 years on a SSD and HDDs. It's very convenient to do this. I'm thinking of getting rid of all those technicolored molex cables and those ribbon data cables and just using the eSata ones. This will make connections easier and remove the tangle inside the case. I made the mistake of using the old type of case where the HDD bays are facing the motherboard because this makes it very difficult to remove the drives without crashing into the motherboard and assorted cables. Some better cases have the bays at 90degrees to this so the drives can be removed easily. http://tinypic.com/m/j0vaiv/1 See the tangle! |
#6
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Sata computer cable.
On 11/04/2015 11:29 PM, Peter Jason wrote:
On Wed, 4 Nov 2015 22:09:20 -0600, philo wrote: On 11/04/2015 08:24 PM, Peter Jason wrote: https://images-na.ssl-images-amazon....1Ao-pEVeYL.jpg This one is the USB3 version, but there seems no power connection. Does the power come with the USB3? Yes, it is self-powered Thanks, I'll get one. Very hard to find at retail outlets. Before you get it though , read the specs The USB2 type comes as "eSata" with a power connection: http://www.sednacomputer.com/photo/se-c-poesata-1m.jpg and I'm using this now. Can I just use the USB3 type instead? Peter |
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