Explanation of hard disk capacity | Lenovo Y450 manual

Explanation of hard disk capacity

Dear user,

While using your computer, you may discover 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. 1GB = 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 GB, 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

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Lenovo Y450 manual Explanation of hard disk capacity

Contents

Lenovo IdeaPad Y450 Page Energy Star model information Page Explanation of hard disk capacity Page Contents 108 Contents107 129 Iii110 Top view Getting to know your computer Speakers System status indicators Getting to know your computer Wireless LAN antennasPower button Array microphone built-in Getting to know your computer Left-side view Fan louvers Getting to know your computer Security keyhole Right-side view AC power adapter jack Front view Integrated wireless device switch Getting to know your computer System status indicators Bottom view Battery latch manual Getting to know your computer Battery latch spring loaded Using the touchpad Using your computer „ Gestures Using your computerChiralMotion Pinch „ Palm Check „ Numeric keypad Using the keyboard „ Function key combinations Using your computer „ Touch inductive panel with multi-media buttons Special keys and buttons OneKey Theater Using your computer SlideBar „ OneKey Rescue System button Using the optical drive Using memory cards „ Removing a memory card „ Inserting a memory card Using the integrated camera Using Lenovo remote specific models only „ Using RJ-45 port Using the Internet „ Using wireless LAN „ Attaching a security lock optional Securing your computer „ Using passwords „ Using VeriFace „ Checking battery status Installing device driversUsing battery and AC adapter „ Using the AC adapter „ Charging the battery „ Handling the battery Connecting a Universal Serial Bus USB device Using external devices Using external devices Connecting an eSATA device Connecting an Ieee 1394 device Connecting an ExpressCard/34 device „ Removing an ExpressCard device „ Inserting an ExpressCard device „ Connecting a VGA monitor Connecting an external display „ Connecting an Hdmi monitor Connecting a headphone and audio device Using external devices Connecting an external microphone „ Enabling Bluetooth communications Connecting Bluetooth enabled devices specific models only Frequently asked questions Troubleshooting Where are the recovery discs? Troubleshooting When I turn on the computer, nothing appears on the screen Troubleshooting„ Display problems My screen goes blank while the computer is on „ Keyboard problems „ a password problemForgot my password Number appears when you enter a letter Computer enters sleep mode unexpectedly „ Sleep or hibernation problems Screen is blank „ Computer screen problems Incorrect characters appear on the screen Troubleshooting Screen is unreadable or distorted „ Battery problems „ Sound problemsOperating time for a fully charged battery is short Computer does not operate with a fully charged battery „ a startup problem „ a hard disk drive problemTroubleshooting Battery does not charge Hard disk drive does not work Computer does not start from a device you want „ Other problemsYour computer does not respond Getting help and service Getting help and service Getting help on the Web Getting help and service Getting help and service Getting help and service Getting help around the world Important safety information Safety, use, and care information „ Conditions that require immediate action Safety, use, and care information „ Safety guidelines „ Service and upgrades „ Power cords and power adapters Safety, use, and care information „ Plugs and outlets „ Extension cords and related devices „ Power supply statement „ Lithium coin cell battery notice „ Heat and product ventilation Safety, use, and care information „ CD and DVD drive safety „ Electrical current safety information Safety, use, and care information „ Laser compliance statement Safety, use, and care information „ Liquid Crystal Display LCD notice Caring your computer „ Be careful about where and how you work Safety, use, and care information Safety, use, and care information „ For outdoor use „ Be gentle with your computer„ Carry your computer properly „ Handle storage media and drives properly „ Data safety „ Other important tips „ Take care in setting passwords „ Cleaning the cover of your computer „ Cleaning your computer keyboard „ Cleaning your computer display Accessibility and comfort „ Ergonomic information Safety, use, and care information „ Questions about vision? Maintenance„ What if you are traveling? „ General tips for maintenance Safety, use, and care information Safety, use, and care information „ What this warranty covers Appendix A. Lenovo limited warranty Appendix A. Lenovo limited warranty „ How to obtain warranty service„ What your Service Provider will do to correct problems Warranty Information „ Replacement of a product or part „ Use of personal information „ Your additional responsibilities „ What this warranty does not cover „ Limitation of liability „ Dispute resolution „ European Economic Area EEA „ Other rights „ Suplemento de Garantía para México 100 101 Warranty Information 102 „ Types of warranty serviceCustomer Replaceable Unit CRU service Courier or depot service On-site serviceCustomer carry-in or mail-in service 103 104 Product exchange service 105 Warranty service telephone numbers 106 107 Appendix B. Customer Replaceable Units CRUs 108 Appendix C. SpecificationsEnvironment ƒ Temperature 109 Appendix C. SpecificationsBattery pack 110 Appendix D. Notices Appendix D. Notices 111 112 „ Export classification notice„ Television output notice 113 „ Wireless interoperability 114 115 „ Usage environment and your health 116 Electronic emissions notices„ Federal Communications Commission FCC statement 117 „ Industry Canada Class B emission compliance statement„ Avis de conformité à la réglementation d’Industrie Canada 118 „ German Class B compliance statement 119 120 „ European Union compliance statement Class B compliance 121 „ Korea Class B 122 Weee and recycling statements„ General recycling statement 123 EU Weee statements 124 Japan recycling statements 125 „ Disposing of a Lenovo computer components 126 127 128 129 Index 130 Problems Index 131 If your product is not working correctly Do not Return IT to the Store New World. New Thinking.TM