Acomdata PDHD1000USE-72, User Manual

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However, data transfer rates between two devices are limited by
the device with the slower interface. For example, if you plug a
USB 2.0 device into a USB 1.1 port on your computer, data transfer
rates between the computer and the deivce will be limited to USB
1.1 speeds.
USB uses a master-slave architecture. The computer (the 'master')
dictates data flow to, from, and between attached USB devices
(the 'slaves'). A single USB bus can support up to 127 USB devices.
However, connecting more than a few USB devices to a computer
usually requires one or more USB hubs.
eSATA
(eSATA-equipped models)
Parallel ATA (PATA) technology served computers well for about
two decades. However, increasingly faster hard disk transfer rates
have forced the ATA interface specification to be continuously
updated in order to avoid becoming the limiting factor in disk I/O
performance.
SATA, a serial implementation of the ATA interface, was developed
by the Serial ATA International Organiztion in response to this need.
SATA's serial architecture can achieve faster data transfer rates than
PATA by overcoming a number of electrical signalling constraints
inherent in a parallel architecture. SATA can also be scaled to
accommodate increasing storage capacities and higher perfor-