How long would it take to transfer 1TB over USB 2.0?

How long would it take to transfer 1TB over USB 2.0? This might be a completely stupid question because it is conceivably highly dependent on the respective disk speeds. But I am thinking that there is a speed cap that is specific to USB 2.0 that would by itself define a lower limit.
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Total answers/comments: 6

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bert [Entry]

USB 2.0 has a signaling rate of 480 Mbit/s. The same article says that typical real-world throughput is "about two thirds of the maximum theoretical bulk data transfer rate of 53.248 MB/s." If my math is correct, and it probably isn't, that suggests that the best time you could hope to achieve is about 8.2 hours for 1 TB, assuming that the USB connection is the biggest bottleneck.

bert [Entry]

"From experience, I know USB 2.0 copies about 10Mb/sec on average (on my system).

So that would be
1TB == 1048576 Mb
1048576 / 10 ==> +/- 104857 secs
104857 / 60 ==> +/- 1747 mins
1747 / 60 ==> +/- 29 hours

So a full day and 5 hours.

Note that I use teracopy as the default copy handler of my windows (otherwise I never get the 10Mb/sec average over usb)."

bert [Entry]

"It's not just dependent on Disk speeds, but also the speed of the IDE/Sata controller on the external drive / USB key. I've found that many cheaper external drives are slower, they are still USB2 but have cheaper and slower IDE/Sata controllers.

Of course USB 2 has a theoretical max throughput of 480 Mbit /s [Clarified to stop uninformed comments], so you could work out pretty easily the absolutte fastest time (but this time would never happen in real life of course)."
"It's not just dependent on Disk speeds, but also the speed of the IDE/Sata controller on the external drive / USB key. I've found that many cheaper external drives are slower, they are still USB2 but have cheaper and slower IDE/Sata controllers.

Of course USB 2 has a theoretical max throughput of 480 Mbit /s [Clarified to stop uninformed comments], so you could work out pretty easily the absolutte fastest time (but this time would never happen in real life of course)."

bert [Entry]

"I just completed 2 of these transfers and I'm surprised at the slow USB 2.0 speed I'm getting. I copied 1 TB (terabyte) of video files and it took about 16 hours. Avg speed was in the 30's. The 2nd about a week later to a different external HD was 18 hours. And I was annoyed at the 1st transfer :)

time for esata external storage box with 4 or 5 bays!!!!"

bert [Entry]

"Depending on the file transferring rate, you can easily benchmark this copying a file of 100 Mb and try to extrapolate that to 1 Tb

With USB sticks I get about 4 Mb/s with large files from my MyBook I get 25 Mb/s"

Iepmwe [Entry]

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