| eSata vs Sata II vs USB2 Does anyone know the REAL difference in speed you will see between the USB 2.0 and SATA II or eSATA connections using the above test methods?
A friend of mine who thinks he knows it all (Masters in CS) says that the speed difference is negligible. As far as stats go, and stats alone, he is wrong-- 480 Mbps (USB 2.0) vs 780Mbs 7200 RPM SATA 150 HD transfer rates. But I'm wondering if he is more right when comparing real world testing parameters.
Thanks-- |
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 eX_NihiLoHere's Your Something For NothingPremium
join:2003-08-05
Louisville, CO | Your CS friend takes too much stock in the theoretical speed of usb 2.0 . In the real world an external drive using an usb 2.0 interface will get 20-30 Mps vs 75-85 Mps for eSATA which is very noticable with large reads/writes. |
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 Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | reply to Suffed Pig
Uhmm I thought eSATA just meant that it was for external SATA things? |
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 Anonymous_AnonymousPremium
join:2004-06-21
127.0.0.1
kudos:2 | reply to Suffed Pig
i'd use SATA 2 3 Gigabit/s(overhead 600Mbit) or 300MB/s(2400Mbit/s) |
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| reply to Suffed Pig
eSATA is just SATA2 over external cabling (slightly different signal levels), so there's no speed difference there. USB, well, is high overhead protocol over a shared line, and with faster devices it can have a significant effect on throughput . |
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| Even firewire 400 is faster then usb 2.0 |
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| reply to Suffed Pig
Does anyone know the REAL difference in speed you will see between the USB 2.0 and SATA II or eSATA connections using the above test methods?
This thread started my curiosity. I just backed up 8.16 GB of data using eSATA 1.5. It took 6 minutes. I then backed up using a WD series II USB 2.O this took 18 minutes. To me this is based on a trial effort. No marketing hoo haa. |
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| Sounds about right. I get about 17-18 MB/s reads from an external USB2. Still didn't get the new firewire800 card working, so no numbers for that yet. (e)SATA should be about 50-80 MB/s. |
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 howiePremium
join:2003-04-08
Antarctica
kudos:4
1 edit | 
Seagate 400GB 7200.9 16MB USB2 | 
Seagate 400GB 7200.9 16MB Firewire 400 (IEEE1394) | 
Seagate 320GB 7200.10 16MB SATA 150 Internal |
eSATA should be the same as internal SATA. |
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 TA63ST215WPremium,MVM
join:2000-11-23
there
kudos:2 | reply to Suffed Pig
Thanks!
I now see why there is a relative dearth of External hard drive enclosures that take SATA drives.
--
Overheard: "I could careless matter of Fact"
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| »www.icydock.com I have an external USB2/Firewire800 (they also offer eSATA externals) and recently replaced the 5-in-3 drive racks in my fileserver with their racks.
If their internal 3-in-2 SAS rack was available in white, I'd be getting one of those soon too. |
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