Explanation of hard disk capacity | Lenovo U455 guide

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 80GB hard disk will appear as less than 80GB 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

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Lenovo U455 manual Explanation of hard disk capacity

Contents

Lenovo IdeaPad U455 First Edition December Copyright Lenovo Dear user Explanation of hard disk capacity Page Page Contents Contents Appendix B. Use and care Appendix F. FeaturesAppendix C. Lenovo limited 120 Important safety information Important safety information„ Read this first Iii Important safety information Unpack Important safety information Working place Important safety information Correct usage procedures Important safety information Vii Important safety information Service and upgrades Viii Getting to know your computer Power button Getting to know your computerIntegrated Camera Fingerprint TouchpadReader Left-side view Adapter jack Right-side view Bottom view Battery pack Compartment Battery latchSIM card slot Select models only Memory „ Connecting to the power Installing the battery packConnecting the computer to an electrical outlet Learning the basics „ Configuring the operating system „ Turning on the computerLearning the basics Putting your computer into sleep state „ Shutting down your computer „ Checking battery status Using AC adapter and battery„ Charging the battery „ Removing the battery pack „ Handling the battery Left click button Using the touchpadRight click button „ Gestures Pinch zoomTwo-Finger Scrolling Rotating Learning the basics Three-Finger Flick Using the keyboard „ Numeric keypad „ Function key combinations Fn + Esc Fn + F1Fn + F2 Fn + F3 Connecting external devices „ Using memory cards not supplied „ Inserting a memory card „ Connecting a universal serial bus USB device„ Removing a memory card „ Connecting a Bluetooth device Select models only Enabling Bluetooth communications on your computer Switching GPU Select models only Learning the basics Special keys and buttons Volume buttons ~ Learning the basics OneKey Rescue system button Indicator System status indicatorsTouchpad indicator Securing your computer „ Attaching a security lock not supplied „ Using VeriFace „ Using passwords „ Fingerprint reader Using the Internet Wired connection „ Software configuration Using the Internet„ Hardware connection Cable Wireless connection Wi-Fi „ Using Wi-Fi/WiMax Select models only Enabling wireless connectionSoftware configuration Hardware connection „ Using Mobile Broadband Select models only Inserting the SIM card Removing the SIM card Using the Internet OneKey Rescue system OneKey Rescue system„ Introduction OneKey Rescue system OneKey Rescue system Troubleshooting Frequently Asked Questions Troubleshooting Where are the recovery discs? What can I do if the backup process fails? Troubleshooting Display problems Problems with GPU switching Computer is on Keyboard problems Troubleshooting Password problemSleep or hibernation problems Mode immediately after Troubleshooting Computer screen problems Sound problems Hard disk drive problem Troubleshooting Battery problemsStartup problem Troubleshooting OneKey Rescue system problems Other problems Connected external To replace the battery, do the following Replacing the batteryUpgrading and replacing devices Upgrading and replacing devices Replacing the hard disk drive Handling a hard disk drive Upgrading and replacing devices Upgrading and replacing devices Upgrading and replacing devices Replacing memory Upgrading and replacing devices Upgrading and replacing devices Upgrading and replacing devices Upgrading and replacing devices Appendix A. Getting help and service Appendix A. Getting help and service Getting help on the Web Appendix A. Getting help and service Appendix A. Getting help and service Getting help around the world Appendix B. Use and care information „ Be careful about where and how you workCaring for your computer „ Notice of static-electricity Appendix B. Use and care information „ Be gentle with your computer „ Carry your computer properly „ For outdoor use „ Handle storage media and drives properly „ Take care in setting passwords „ Data safety„ Other important tips Appendix B. Use and care information Accessibility and comfort „ Ergonomic information „ What if you are traveling? „ Questions about vision? Maintenance „ General tips for maintenance Appendix B. Use and care information „ Cleaning the cover of your computer „ Cleaning your computer keyboard „ Cleaning your computer display Appendix C. Lenovo limited warranty „ What this warranty covers „ What your service provider will do to correct problems „ How to obtain warranty serviceAppendix C. Lenovo limited warranty Information „ Replacement of a product or part „ Your additional responsibilities „ Use of personal information „ What this warranty does not cover „ Limitation of liability „ Dispute resolution „ Other rights „ European Economic Area EEA „ Lenovo Turkey address Lenovo Technology B.V. Turkiye Istanbul Subesi Warranty information „ Types of warranty service Customer Replaceable Unit CRU Service Courier or Depot Service Appendix C. Lenovo limited warranty On-site ServiceCustomer Carry-In or Mail-In Service Product Exchange Service Appendix D. Customer replaceable units CRUs Appendix D. Customer replaceable units CRUs Appendix E. Notices Appendix E. Notices „ Export classification notice 100 Energy Star model information 101 102 Windows „ Wireless interoperability Wireless related information103 „ Usage environment and your health 104 „ Safety information related to Mobile Broadband 105 106 „ Federal Communications Commission FCC Statement Electronic emissions notices107 „ Industry Canada Class B Emission Compliance Statement 108 „ German Class B Compliance Statement „ Avis de conformité à la réglementation d’Industrie Canada109 110 „ European Union Compliance Statement Class B Compliance 111 112 „ Korea Class B „ Japan Compliance Statement for Power line Harmonics113 „ General recycling statement Weee and recycling statements114 EU Weee statements 115 Japan recycling statements 116 „ Disposing of a Lenovo Computer Components 117 118 119 Appendix F. Features and Specifications 120Model Name IdeaPad U455 Form Factor 121 Appendix F. Features and Specifications PortsOthers Trademarks 122 Index 123 124 Index 125 Page Do not Return IT to the Store If your product is not working correctly New World. New Thinking.TM