If your hard drive contains a significant amount of unallocated space, use the following detailed process to add the unused space to the hard drive.
Do not use the RECOVERY or FACTORY_IMAGE partitions! This will allocate unused space to the system recovery partition, which should only be used to restore your computer.
Do not use the SYSTEM partition! Windows uses this partition to store important system files, including startup recovery and system restore points.
In Windows 10 and 8, right-click Start and select Computer Management.
If you are prompted for an Administrator password or confirmation, enter the password or confirm.
You can view the amount of unallocated space on the drive from the Computer Management screen. Unallocated space appears in a section without a partition label and with a black bar across the top. Unallocated space is unused space on the hard disk that cannot be used.
On the Computer Management screen, right-click the hard drive volume that you want to expand (for this example, Disk 0 (C :)), and select Extend Volume. Do not select the SYSTEM, RECOVERY, or FACTORY_IMAGE partitions.
Select the disk you want to extend, set the amount of space to extend, and then click Next. To accept the maximum amount of unallocated space available, do not change any of the sizes shown.
The previously unallocated space can now be used and the correct values for the drive capacities are displayed in the Computer Management window.
Different software / hardware and vendors use different methods to measure gigabytes. What Windows shows as the size of the hard drive may be smaller than the actual size.
Manufacturers describe and advertise hard drives in terms of decimal (or base 10) capacity. In decimal notation, one megabyte (MB) equals one million bytes, and one gigabyte (GB) equals one billion bytes. The decimal system is what we use every day.
Windows and other programs have reporting capabilities that use the binary (or base 2) numbering system. In the binary system, a megabyte equals 1,048,576 bytes, and a gigabyte equals 1,073,741,824 bytes.
When determining hard drive capacity with software that reports in base 2 notation, multiply the value of 2 notation by 1,048,576 to determine the decimal equivalent.
The information stored in the Recovery or Factory Image partition is important system information, consisting of a backup copy of Windows and the original software.
Recovery information on HP computers prior to Windows Vista was provided on discs. HP no longer includes recovery discs with most computers because:
Recovery from hard drive is considerably faster than from discs and requires no disc swapping.
You must still create a set of recovery discs using the HP-provided recovery program. For more information, read How to obtain a recovery CD or DVD set.
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