Lenovo B450 User manual

New World. New Thinking.TM
www.lenovo.com
©Lenovo China 2009
P/N: 147002479
Printed in China
B450 User Guide V1.0 cover_1-4
Lenovo
B450
User Guide V1.0

First Edition (July 2009)
© Copyright Lenovo 2009
B450 User Guide V1.0 cover_2-3
If your product is not working correctly,
DO NOT RETURN IT TO THE STORE.
For technical assistance, contact a Lenovo support
specialist 24 hours a day by calling toll free 1-877-4
LENOVO (1-877-453-6686).
Additionally, you can find support information and updates
on the Lenovo Web site located at
http://consumersupport.lenovo.com.
* Only for the users from the United States.
LENOVO products, data, computer software, and services have been developed exclusively at private expense
and are sold to governmental entities as commercial items as defined by 48 C.F.R. 2.101 with limited and
restricted rights to use, reproduction and disclosure. LIMITED AND RESTRICTED RIGHTS NOTICE: If
products, data, computer software, or services are delivered pursuant a General Services Administration “GSA”
contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-35F-05925.
•Before using this information and the product it supports, be sure to read Important safety
information on page iii and Notices in Appendix E first.
•Some instructions in this guide may assume that you are using Windows Vista®. If you are using
other Windows operating system, some operations may be slightly different. If you are using
other operating systems, some operations may not apply to you, but it won’t substantially affect
your use of this computer.
•The features described in this guide are common to most models. Some features may not be
available on your computer and/or your computer may include features that are not described in
this user guide.
•The illustrations in this manual may differ from the actual product. Please refer to the actual
product.
Notes

Respective Users
Dear user,
Thanks for purchasing Lenovo notebook! Before using this product,
please make sure to read this User Guide carefully.
We are most honored to have you as our customer. In order to make sure
you master the usage of Lenovo notebook soon, we have prepared this
User Guide for you. This manual has been made very simple and
comprehensive. In this manual, you can get information on the system
configuration, installation steps and the basic operating systems. We
strongly recommend that in using this product, please be sure to carefully
read the manual. It will actually help you make better use of the computer.
We have done our best to avoid human errors in making sure that the
information provided in the manual is accurate and reliable. However, we
cannot completely guarantee that there will not be any mistakes that were
not found and checked out before printing.
Please bear with us because there might also be some uncontrolled
omissions while printing, binding or distributing.
Because we are trying to improve the full performance and reliability of our
equipment, the hardware and software components might need some little
adjustment. In this case, this might lead to an inconsistency in the actual
makeup of the equipment to that of the information stated in the manual,
but it will not substantially affect your use.
Thanks for your cooperation!

Explanation of hard disk capacity
Dear user,
While using your computer, you may find that the nominal hard disk
capacity indicated is somewhat different from the disk capacity
displayed by the operating system. For example, a nominal 40GB hard
disk will appear as less than 40GB in the operating system. This
discrepancy is not an error in hard disk installation nor any other
problem, but a normal phenomenon of computers. This phenomenon is
primarily due to the following reasons:
I. Different standards used by the manufacturer and operating
system when calculating hard disk capacity
Hard disk manufacturers use a radix of 1000, i.e., 1G = 1,000MB, 1MB =
1,000KB, 1KB = 1,000 bytes. However, when identifying hard disk capacity,
operating systems use a radix of 1024, i.e., 1GB = 1,024MB, 1MB = 1,024KB,
1KB = 1,024 bytes. The standard adopted by your computer is that of the
hard disk manufacturers. Since the standards adopted by the hard disk
manufacturer and operating system are different, the hard disk capacity
displayed by the operating system will be different from the nominal hard
disk capacity.
For example, if the hard disk is nominally X G, even when it is completely
empty, the capacity displayed by the operating system will be:
X × 1000 × 1000 × 1000/ (1024 × 1024 × 1024) ≈X × 0.931 G

In addition, if a portion of the hard disk space has been used for some
specific purpose, then the capacity indicated by the operating system will
be even less than X × 0.931 G.
II. A portion of the hard disk space is used for specific purposes
Lenovo computers may come with preinstalled OneKey Rescue System, so
the hard disk has a special portion partitioned before delivery, which is
used to store hard disk mirror and OneKey Rescue System program files.
The size of the reserved space for this partition varies according to the
model, operating system and software of the computer. For the sake of
safety, this partition is not apparent, which is commonly referred to as a
“hidden partition”.
In addition, after the hard disk is partitioned or formatted, the system will
assign a certain amount of hard disk space for the system files.
For the above reasons, the available hard disk space indicated by the
operating system is always less than the computer’s nominal hard disk
capacity.