There's very little performance difference if any at all.Ħ0MB/s is the raw theoretical absolute maximum data rate on USB2.
Conversely you can buy a simple Rosewill add in card, power it from the PSU and split chores between your built in USB ports and the add in card. It's expensive but they do work to solve issues like that. And I'd consider that typical when someone can buy a dock for 40 dollars with that card I mentioned had four individual HUBS, one port for each hub, plugging devices into them won't cause amperage drops or performance drops on the other HUBS/ports on the card. So not only does it come close, it matches it. So yeah it can match the native SATA throughput since the drive itself is the bottleneck. UASP further decreases the latency penalty of USB 3. I have a USB 3 dock here on my desk that will max out an OCZ enterprise SATA SSD, specifically an Intrepid 3700, I have multiple sizes. The USB controller used in a typical Western Digital or Seagate external drive enclosure is not going to come close to an internal SATA drive. I've never seen UASP devices, but I'm guessing you will only find this is in devices targeted at the server market. The USB controller does add latency and reduce performance compared to the native SATA interface of the drive. Never the less, I've never seen an external USB 3 drive match a SATA drive for performance. Sorry, USB 2.0 is up to 480 Mbps, or 60 MB/s although I'm not sure this is accounting for encoding overhead. I've attached backup disks to USB 3 that max the drive (150 - 200 MB/s depending on where the heads are) in exactly the same fashion as a native SATA. A 100MB/s hard disk would be consider slow by new drive standards. WIth USB 3 external enclosures supporting UASP drives easily max out. Modern SATA drives are capable of over 100 MB/s.Įverything stated here regarding performance of USB 3 and SATA attached USB is wrong. USB 3.0 is technically capable of 60 MB/s, but I've never seen more than 40 MB/s and the latency is relatively high. If you actually want any level of performance or reliability from the drive though, you would be better with SATA drives.Įxternal USB drives use SATA internally, but the USB controller adds another layer that reduces performance.
Speed and power from an add-in card should be much the same as the onboard USB 3.0 ports.
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