How fast is USB 3 meant to be?

[PsychoPigeon]

I bought an external HDD and I'm getting a top speed of 60MBps, this is after installing a USB 3 driver when previously it was using USB 2 with a speed of 28MBps. USB 3 is enabled in my BIOS. My motherboard is an MSI P67A-GD53.

 

[Kotu]

625 MB/s, A normal hard drive is not going to reach anywhere near that though. 60MB/s could be about right for a 2.5" 5400rpm external.

 

[FredFlint]

I have 3 external USB 3 drives and they all top out about 95MB/s. All of them are 5400rpm drives, Samsung 1TB, Samsung 2TB and a Toshiba 2TB.

 

[AthlonXP1800]

Nope external HDD only maxed up to 100MB/s, if you want to get nearly USB 3.0's 625MB/s performance, you could need a 2.5 inch external caddy with SSD to achieve up to 550MB/s.

 

[Combat squirrel]

kotu is wrong its not 625mb otherwise my external ssd to internal ssd transfers would hit 500mb, in reality its 100-110mb and thats with devices that can read n write well faster than that.

 

[Raiden85]

My USB 3.0 3.5" 2TB will hit just over 200 MB/s, my USB 3.0 500Gb Toshiba and 2TB WD Passport 2.5" HDD's hit around 100 MB/s.

 

[demon8991]

My USB 3.0 3.5" 2TB will hit just over 200 MB/s

Really? There are no 7200rpm consumer grade internal HDD's that will do that

 

[Kotu]

Official USB site

SuperSpeed USB (USB 3.0) from the USB-IF
SuperSpeed USB has a 5 Gbps signaling rate

5Gbps = 625MBps.

Bear in mind with that write caching will give deceptive speeds on smaller transfers as you are writing at full speed to the drives cache to start with.

Combat squirrel, might be worth you benchmarking the external SSD to see if its performing properly.

 

[Raiden85]

Really? There are no 7200rpm consumer grade internal HDD's that will do that

Both HDD's are the same internal 2TB Seagate 7200rpm drives, but I use my own separate USB 3.0 enclosure for the external one.

External USB 3.0 Seagate 2TB 7200rpm.



Internal Seagate 2TB 7200rpm.