Usb2 how fast

Taken from the USB Wikipedia page :. I have never really thought much about calculating the speed, but clearly there is real overhead associated with this kind of transfer. I searched on Google and found post after post with speeds as you described, making me thing you are on to something. I just whipped out a USB 2. I then rebooted to clear the memory , and tried it without my AV running and it still took , or only 2 seconds less I guess that is good news for Symantec AV at least.

Any chain is only as strong as its weakest link. The potentially weak transfer performance when using USB2 devices include everything from the host controller firmware, driver software, physical cables used shorter and thicker may be slightly better? Stated theoretical maximum performance megaBITs or 60 megabytes per second is only for the bus not things connected to it and quite often the actual observed performance is much lower. Even rpm or 10, rpm drives in a good USB caddy aren't really up to much.

Most of the "lost bandwidth" is actually controller latency, where it just takes time to turn around from writing the data to sending the completion signal. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. What's the maximum typical speed possible with a USB2. Ask Question. Asked 10 years, 3 months ago. Active 11 months ago.

Viewed k times. Improve this question. Maximum typical speed? Isn't that an oxymoron? Mehrdad: Not really. Oh then you mean maximum practical speed, right? Mehrdad: Same thing. Do you have any kind of compression or maybe multiple virus scanners running? Try disabling them. Make sure the cable is rated for USB 2.

If it is old, it may be a slower-rated cable. I assume you would have said something if it were going through a USB hub. Is it slow for other devices, like a flash drive you would need to check its rated transfer rate. Show 3 more comments. Active Oldest Votes. In practice the limit will usually be the flash itself.

Improve this answer. This means when a USB 2. It is important to note that a USB 3. But, a USB 3. In other words, a USB 3. This means the data are both sent and received over the same pathway. Thus, USB 2. It is the presence of these five additional wires that increases the bandwidth of USB 3. The superior performance of USB 2. In terms of price, USB 2. You can buy an affordable USB 2. With USB 3. We should note that price will always be less of an issue when you buy from Everything But Stromboli.

Brian V I was also told that ESata and Firewire do not have this limitation. This thread is locked. You can follow the question or vote as helpful, but you cannot reply to this thread. I have the same question Report abuse. Details required :. Cancel Submit. In reply to Brian V01's post on September 18, To summarise: USB 2. How satisfied are you with this reply? A subscription to make the most of your time.

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