2.4 "en-us"
: Microsoft Support may have mounted this image remotely to perform system repairs or updates. Microsoft Learn How to Remove It
Alternatively, use the command-line tool diskpart to create a bootable USB from the ISO. 2. Removing the Mounted ISO If the virtual DVD drive appeared unexpectedly: ces-x64frev-en-us-dv9
Labels like "ces-x64frev-en-us-dv9" frequently appear as file names, volume labels, or metadata descriptors associated with software distribution images—especially optical disc images (DVDs), ISO files, and downloadable installer packages. Such strings are compact encodings that convey platform architecture, build channels, language/locale, media type, and other build-time attributes. Understanding these labels is useful for system administrators, digital preservationists, and cybersecurity professionals who must manage, validate, and deploy software across heterogeneous environments.
: If it claims the file is "in use," a system restart will typically release the file lock, allowing you to eject it or delete the source ISO file. Microsoft Learn troubleshooting a drive that won't eject? Removing the Mounted ISO If the virtual DVD
To understand what represents, we can look at the standard naming conventions used by Microsoft for ISO files and disc labels:
Users have documented the process of using the CES_X64FREV_EN-US_DV9.iso file to create bootable USB drives. One workflow describes using a tool called WinISO to create an ISO image from a Windows 10 Enterprise LTSC 2021 DVD-ROM. Another method involves using an executable to write the ISO image to a USB drive, which can then be used to boot and install Windows. This practical usage highlights how the code is an integral part of guides for installing Windows on modern hardware, including systems with M.2 SSDs. : If it claims the file is "in
| Code Prefix | Product / Edition | Architecture & Build | Language | Media Rev | | :--- | :--- | :--- | :--- | :--- | | CES_X64FREV_EN-US_DV9 | Windows 10 Enterprise LTSC | x64, FRE, variant | EN-US | DV9 | | SSS_X64FREV_EN-US_DV9 | Windows Server 2019 | x64, FRE, variant | EN-US | DV9 | | IR5_CENNA_X64FREV_EN-US_DV9 | Windows 8.1 Enterprise N | x64, FRE, variant | EN-US | DV9 | | CCSA_X64FRE_ZH-CN_DV5 | Windows 11 (Consumer) | x64, FRE | ZH-CN | DV5 | | CPBA_X64FRE_EN-US_DV9 | Windows 11 Business | x64, FRE | EN-US | DV9 | | CCOMA_X64FRE_EN-US_DV9 | Windows 10 (Unknown channel) | x64, FRE | EN-US | DV9 | | CENA_X64FREE_EN-US_DV9 | Windows 10 (Unknown channel) | x64, FREE | EN-US | DV9 | | IR5_CCSA_X64FRE_ZH-CN_DV9 | Windows 8.1 (Consumer) | x64, FRE | ZH-CN | DV9 | | GSP1RMCPRXFRER_CN_DVD | Windows 7 (Legacy) | Legacy format | CN | DVD |
If you see this volume label on your computer and are unsure how to handle it, look at its context in your sidebar:
This segment is the most likely source of confusion. In Microsoft's naming, this typically appears as "FRE", which stands for "Full Release Edition". The "V" in "frev" is often an erroneous addition. Therefore, "x64frev" is almost certainly meant to be x64FRE , denoting a 64-bit Full Release Edition. This conclusion is supported by numerous examples of official media labels like SSS_X64FREV_EN-US_DV9 and community discussions identifying FRE = Free from Mr. Threat .