Acomdata PDHD1000USE-72, User Manual

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1
Hi-Speed USB 2.0
USB 2.0 has a maximum interface transfer rate (ie bandwidth) of
480 Mbps (
M
ega
b
its
p
er
s
econd). That's 40 times faster than the
earlier standard, USB 1.1 (12 Mbps).
Performance in day-to-day use will depend on many factors,
including CPU utilization, file system overhead, and the structure
and number of files being transferred. Also, as with any data I/O
(input/output) technology, some bandwidth is taken up data
transmission protocols (this is called interface overhead ). In day-to-
day use you can expect maximum, sustained transfer rates in the
mid-30s MB/s (Mega bytes per second).
Interface transfer rates are expressed in bits per second (e.g.
mbps – megabits per second) because this is the truest way of
measuring raw interface performance. However, for the end user
it is more meaningful to express transfer rates in bytes per second
(e.g. mB/s – megabytes per second) because computer files are measured
in bytes (kilobytes, megabytes, etc.).
USB 2.0 is backward compatible with USB 1.1. This means you
can connect a USB 1.1 device to a USB 2.0 port, and vice versa.
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