Acomdata m-hdxxxuhe5-72 User Manual

number of files being transferred, and; the speed at which

other devices can transfer data to/from the Drive. Also, as is

the case with any data I/O (input/output) technology, some

bandwidth is taken up by the protocols that structure and

govern data transmissions—this is called interface overhead.

Given these and other factors, in day-to-day use you can

expect to get maximum, sustained transfer rates in the mid-

30s MB/s (Megabytes per second).
Note: The interface transfer rate specification of an I/O technol-

ogy, such as USB, is expressed using the bit as the base unit (e.g.

Mbps) because this is the truest way of measuring raw interface

performance. However, for the end user it is more meaningful to

express day-to-day transfer rates using the byte as the base unit

(e.g. MB/s) 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. However, interface transfer rates are limited by the

interface with the lower bandwidth. So, for example, if you

plug a USB 2.0 device into a USB 1.1 port on your computer,

data transfer rates will be limited to USB 1.1 speeds.
USB uses a master/slave architecture. This means the com-

puter (the "master") dictates data flow to, from and between

attached USB devices (the "slaves"). A single USB bus can