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Can't get eSATA port on Latitude E6510 to work

Hi,
 
I have a Latitude E6510 with an eSata port on the side.  I bought a cable from the local computer store from a company which has both SATA and power cables in it (part: Manhattan MH Dual Pwr ESATA Cbl 7P-22P Blk 1.5ft / 0.5m).
 
Unfortunately, when I plug in a SATA drive to the dual cable, nothing happens.  No device is recognized by Win7 nor does the drive spin up.
 
Does anyone know if there's a trick to getting this to work?  Does this port supply 5v / 12v to the eSATA device?
 
I've been to Dell's support site and downloaded what I think are all the latest drivers.
 
Thanks for your help!
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Dr. Klahn

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☠ MASQ ☠

Can't find your cable but on the E6500 there's an eSATA and USB post above each other on the side, you'll need a Y-adapter if you have the same arrangement on the E6510 which takes power from the USB and Data and power from the eSATA/USB above it.  I doubt it has an eSATAp plug which as DrKlahn's link to Wiki will show is a different shape.
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Thanks for your responses.  Here is a link to the cable I purchased:
http://www.microcenter.com/single_product_results.phtml?product_id=0342965

It clearly indicates on the website that power is supplied through the eSATA connector but it sounds like this actually not the case.  I was not aware of eSATAp and it looks like they aren't either.  I will look in the BIOS on my next reboot to see if the port has settings that can be enabled.

What started all this is that I'm looking for the fastest and simplest way to extract/create images on an internal SATA drive using my laptop.  I have a USB to SATA adapter that I use now but it's pretty slow and rather clunky to put together each time I have to use it.

Do any of you have suggestions for connecting a SATA drive to my laptop for the purposes of quick disk imaging?  Based on your comments, it appears that I'll have to return the Manhattan cable I purchased.

Thanks.
Since you have the eSATA port available, that is probably the fastest way to get data out of the system.  In this case, I would look for an eSATA capable drive docking station or an eSATA capable external drive.  If you are working with loose external SATA drives, an external docking station (example) might be the way to go.
Yes, an external eSATA enclosure with it's own power supply to put your drive in would be the best long term solution if you're using the E6150
(provided it isn't simply the BIOS option to switch it on!!)  
Another example - they are all much the same - make sure it supports the eSATA data interface though
http://www.newegg.com/Product/Product.aspx?Item=N82E16817392002
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The fact that the store sold me an eSATA cable with a SATA power connector on the other end yet the eSATA port doesn't inherently supply power is what threw me.  I will take the cable back and let them know this.

Thanks again.  I learned a lot from this experience.
You're welcome.