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Windows 10 includes tools to help you use less drive space. You can now compress the files for the entire operating system, including your preloaded desktop applications. Compact OS lets you run the operating system from compressed files (similar to WIMBoot in Windows 8.1 Update 1), and single-instancing helps you run your pre-loaded Windows desktop applications in compressed files. The new processes helps maintain a small footprint over time by using individual files, rather than combining them in a WIM file.

OS X: x64: 10.8.3+ 1.7.005: Only 64-bit JVM is certified. No longer supported by Apple. Update to a newer OS might be required to address support requests. Windows 10 Compatibility If you upgrade from Windows 7 or Windows 8.1 to Windows 10, some features of the installed drivers and software may not work correctly.

Here's some ways to shrink the image, optimize the image, and some considerations when deploying to low-cost devices.

1. OS X: x64: 10.8.3+ 1.7.005: Only 64-bit JVM is certified. No longer supported by Apple. Update to a newer OS might be required to address support requests.
2. Microsoft will still let you upgrade from Windows 7 to Windows 10 free of charge. Windows 7 support ends January 14th, but you can easily upgrade to Microsoft’s latest operating system.
3. Windows 10 Compatibility If you upgrade from Windows 7 or Windows 8.1 to Windows 10, some features of the installed drivers and software may not work correctly.

Deployment tools that help save space

Compact OS

Compact OS installs the operating system files as compressed files. Compact OS is supported on both UEFI-based and BIOS-based devices. See the size comparison table below.

Unlike WIMBoot, because the files are no longer combined into a single WIM file, Windows update can replace or remove individual files as needed to help maintain the drive footprint size over time.

To deploy Compact OS using a WIM file

1. Boot your destination device with the Windows 10 version of Windows PE. (To use a previous version of Windows PE, make sure you use the Windows 10 version of DISM. To learn more, see Copy DISM to Another Computer.)

2. Create a pagefile equal to 256 MB.

   Where 'C' is the Windows partition.

3. Format and prepare the partitions, and then apply the image to a partition using the DISM /Apply-Image /Compact option:

   This is usually done by running a deployment script. To learn more, see Apply Images Using DISM.

   Note: If you're applying an image in compact mode and using the /ScratchDir option, make sure your ScratchDir folder is not on a FAT32-formatted partition. Using a FAT32 partition could result in unexpected reboots during OOBE.

To deploy Compact OS from Windows Setup

• Use an unattend.xml file with the setting: Microsoft-Windows-SetupImageInstallOSImageCompact.

To deploy Compact OS with a USB bootable drive

For Windows 10, Version 1607 and earlier

1. On your technician PC, open Windows ICD and create your project.
2. Plug in a USB flash drive and note the drive letter (example: D:).
3. Click Create > Production Media > WIM > Enable OS File Compression: Yes > Next > USB Bootable drive > drive letter (D:) > Next > Build.
4. Boot the destination PC using the USB flash drive. Windows installs automatically.

Note When running Windows Imaging and Configuration Designer (ICD) on a PC running a previous version of Windows, such as Windows 8.1, you'll need to install the Windows Assessment and Deployment Kit (ADK) with both the Windows ICD and Deployment Tools features. This installs the latest versions of the drivers required by DISM (wimmount.sys and adkwof.sys) used to create Compact OS images.

To deploy Compact OS from an FFU image

For Windows 10, Version 1607 and earlier

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1. To deploy an FFU image as compressed, the original FFU image must be created as a compressed image.

   From Windows ICD, click Create > Production Media > FFU > Enable OS File Compression: Yes > name the file, for example, D:flash.ffu > Build.

2. You can deploy the FFU image directly to a drive from Windows ICD or from Windows Preinstallation Environment (WinPE). To learn more, see Deploy Windows using Full Flash Update (FFU).

Note When running Windows Imaging and Configuration Designer (ICD) on a PC running a previous version of Windows, such as Windows 8.1, you'll need to install the Windows Assessment and Deployment Kit (ADK) with both the Windows ICD and Deployment Tools features. This installs the latest versions of the drivers required by DISM (wimmount.sys and adkwof.sys) used to create Compact OS images.

Command-line support

You can query whether the operating system is running Compact OS, and change it at any time, using the Compact.exe command.

From Windows PE, determine if the OS is compacted:

Where E:Windows is the folder where Windows has been installed.

From an online installation, change from non-compacted to compacted OS:

Single-instancing of provisioning packages

For Windows 10, when you add new Windows desktop applications to a device, you'll capture these changes into a compressed provisioning package for use by the automatic recovery tools. Rather than maintaining both the original files and the provisioning package, you can use DISM to remove the original files, and run from directly from the compressed provisioning package instead. This is known as single-instancing the image. See the size comparison table below.

While single-instancing is supported on both solid-state drives and rotational drives, for performance reasons, we recommend that single-instancing is only used on devices with solid-state drives.

Example:

where C is the drive letter of the Windows partition.

Warning Do not put quotes with the /ImagePath:C: option.

You can determine whether a provisioning package (.ppkg) is single-instanced by using fsutil.exe:

where C is the drive that contains the provisioning package. Any single-instanced provisioning package on the drive will be listed in the command output. If there are none, the command will return 'Error: The system cannot find the file specified.'

Image optimization

After applying updates to a Windows image, cleanup the image and then export it to a new file:

where C:Imagesinstall.wim is a Windows image file that you want to update. Beginning with Windows 10, version 1607, you can optionally specify the /Defer parameter with /ResetBase to defer any long-running cleanup operations to the next automatic maintenance, but we highly recommend that only use /Defer as an option in the factory where DISM /ResetBase requires more than 30 minutes to complete.

Size requirements and considerations

You'll still need to meet minimum size requirements for the hard drive, RAM, application resource usage, and data storage.

Hard Drive

Windows 10 requires a minimum of 16 gigabytes (GB) of space on 32-bit devices, and 20 GB on 64-bit devices.

Although some configurations of Windows may appear to fit on smaller drives when Windows is first installed, 8 GB SSDs are not large enough. Even if a user pairs an 8 GB hard drive with a second drive that is 4 GB or larger for application and data file storage, 8 GB hard drives do not allow for the increase in the Windows memory footprint that is expected to occur as users work on their computer.

Some of the primary reasons for the increase over time in the memory footprint include the following:

• Servicing. Hard disk space must be reserved for software patches to the operating system and for service pack releases.

• System Restore Points. Windows automatically generate restore points. The amount of space that is required by default is relative to the size of the hard drive. For more information about restore points, see the Restore Points topic on MSDN.Note Users can adjust the amount of space used on the computer for System Restore by using the System Protection user interface in the System Properties dialog box (Sysdm.cpl). Users can also use system image backups that are stored on an external hard disk to restore a system.

• Logs and Caches. The operating system stores files such as event logs and error logs on the drive.

RAM, Pagefile.sys, and Hiberfil.sys

The Pagefile.sys and Hiberfil.sys files increase in size in direct proportion to the amount of RAM on the computer. Windows installations on 16 GB drives have a smaller memory footprint when the computer is limited to 1 GB of RAM. An increase of RAM to a size that is greater than 1 GB will result in increased size of the system files and less space on the hard drive for other applications and files. Increasing the size of the hard drive, however, does not affect the size of these system files. Learn more about On/Off Transition Performance

To save space on the drive, you can remove or reduce the size of the hiberfil.sys. See the size comparison table below. To learn more, see Lab 7: Change settings, enter product keys, and run scripts with an answer file (unattend.xml).

• powercfg /h /type reduced : Reduces the file by 30%
• powercfg /h off : Removes the file.

Language packs and features on demand

Installed language packs (LPs) can take more space than just the size of the LP itself. When you preinstall FODs and UWP apps on a Windows installation that contains multiple LPs, resource files based on preinstalled LPs are also installed. When unused languages are automatically removed after OOBE, corresponding UWP and feature on demand (FOD) resource files are not removed. Preinstalling fewer LPs saves disk space by limiting the number of resource files that remain on a system after removing unused language packs.

Features on demand are distributed in compressed CAB files so the size of an installed FOD is larger than the size of the original CAB. You can use /Get-CapabilityInfo in DISM to view an FOD's download and install sizes. See Features on demand for how to get information about FODs.

Windows optional features

In order to further save disk space on a Windows device, you can disable various optional features that may not be in use.

Through DISM or PowerShell, you can enable or disable Windows optional features as needed.

Applications

Software applications that are installed on the computer may require additional space for caches, logs, and updates. Disk space must also be available on the drive to account for temporary increases in resource usage during installation of applications, patches, and updates.

User Data

On computers that support removable media such as an SD card or USB flash drive, users can easily expand personal data file storage for user documents by using this removable media. However, we recommend that users reserve some space on the hard drive for these types of files.

Size comparisons

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The table below shows the additional space saved by using compact OS, Single instancing, and reducing or turning Off Hiberfile on 2GB (x86 processor architecture) and 4GB (x64 processor architecture), on Windows 10, version 1607:

Related topics

Is your Mac up to date with the latest version of the Mac operating system? Is it using the version required by some product that you want to use with your Mac? Which versions are earlier (older) or later (newer, more recent)? To find out, learn which version is installed now.

If your macOS isn't up to date, you may be able to update to a later version.

Which macOS version is installed?

From the Apple menu  in the corner of your screen, choose About This Mac. You should see the macOS name, such as macOS Big Sur, followed by its version number. If you need to know the build number as well, click the version number to see it.

Which macOS version is the latest?

These are all Mac operating systems, starting with the most recent. When a major new macOS is released, it gets a new name, such as macOS Big Sur. As updates that change the macOS version number become available, this article is updated to show the latest version of that macOS.

If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos.