System Requirements; About Usb 2.0 - Acomdata External Hard Drive USB 2.0 User Manual

S R
YSTEM EQUIREMENTS
System Requirement for PC
• 233 MHz Pentium or equivalent processor, or faster
• Windows 98SE, ME, 2000, or XP
• 32 MB RAM
• Available USB port
Windows 98 users:
Windows 98 First Edition does not support USB 2.0. The
Drive will operate at USB 1.x speeds on Windows First
Edition.
Windows XP users:
In order to use the USB 2.0 connection, you must have at
least Service Pack 1 for Windows XP . Otherwise the Drive
will operate at USB 1.x speeds.
System Requirements for Mac
• Power Macintosh
(G5, G4, Blue & White G3, iBook or iMac)
• Mac OS 9 or Mac OS X
• Available USB port
Mac OS 9 Users:
• We recommended using the latest version (OS 9.2.2).
You can download the updates you need at http://docs.
info.apple.com/article.html?artnum=75288.
• Mac OS 9 does not support USB 2.0. The Drive will oper-
ate at USB 1.x speeds on OS 9. Mac OS 9 requires USB
Mass Storage Support version 1.3.5 or later. You can
download the latest update at http://docs.info.apple.com/
article.html?artnum=60394.
6
A USB 2.0
BOUT
USB (Universal Serial Bus) is an interface technology for
the serial transmission of digital data. The original standard
(USB 1) could transmit data at speeds of up to 12 Mbps.
USB 2.0 has a maximum throughput of 480 Mbps – up to
40 times faster than USB 1. USB is a host-based technol-
ogy, meaning USB devices need to be connected to a com-
puter––either directly or indirectly via a hub––in order to
communicate with each other.
Data transfer rates up to 480 Mbps
480 Mbps is equivalent to 60 megabytes per second. Put
another way, it is possible to transfer a full gigabyte of data in just
under 18 seconds. However, 480 Mbps is the maximum speed;
data transfer rates will vary depending on a number of factors,
including available CPU resources.
Supports up to 127 devices
Connecting more than one or two USB devices to a computer typi-
cally requires the use of one or more hubs: each hub can accom-
modate several USB devices.
Master-slave architecture
The computer dictates data flow to, from, and between attached
devices.
Cable length up to 5 m
On-bus power up to 2.5 W
Suitable for low-power-consumption devices such as flash card
readers.
Plug & Play
You do not need to assign ID numbers, or connect terminators.
On most operating system you do not need to install drivers.
Hot-swappable
Devices can be added and removed while the computer is run-
ning. Also, you can turn off the device when not needed, in order
to conserve electricity.
7