USB 2.0 to eSATA Adapter vs 2 Port eSATA ExpressCard 34

2 Port eSATA ExpressCard 34 vs USB 2.0 to eSATA Adapter

Are these two items the same thing?  

Couldnt I get the USB-eSATA Adpter...

Instead of the 2 Port eSATA ExpressCard 34&
Mark VolzAsked:
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They are not the same. If you use the USB->eSATA adapter, you will be limited to the bandwidth of USB. If you need eSATA connection, you must use Express Card adapter.

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Both serve the same function,  getting eSATA into a laptop but you will probably find a noticable difference in performance.

The USB-eSATA is handy as USB ports are everywhere so it will work with pretty much any computer out there.  The drawback is that you will lose the speed of eSATA and be limited to the USB interface speed, which is much slower.  I would imagine this would even work with a USB 1.1 port,  just very slowly.

The ExpressCard is a more direct connection to the internal BUS and will allow you to take advantage of most of the performance of eSATA.  If performance is important this would be the route to go.

Gary CaseRetiredCommented:
AKMARK5000 =>  Your basic question, "Are these two items the same thing?" has been answered ... NO, they're not the same.   Think of it like connecting a 1/2" hose to a 1" hose with a coupler ==> the combined hose will work; but water can't flow through the combination any faster than it can through the 1/2" hose.   So if you use an adapter to convert eSATA to USB, it's clearly limited to the slower (USB) data rate.

I would guess your "real" question here is whether or not the least expensive of the two adapters would be okay.   You have that answer ... but here's a less expensive ExpressCard eSATA card that will work fine:
Mark VolzAuthor Commented:
Thank you.  I'm using  They have the cableing and the card that I need... 

And the way the Provantage shipping works out I would only save $4 if I went over to Go Vista Shop.  I have the information to compete this project.  

I think I'll wait till the Hitachi HD actually arrives (hopefully next week) and go from there.

Thanks again.
Gary CaseRetiredCommented:
You're most welcome.
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