This is an architecture and build identifier string found in Windows kernel binaries (specifically ntoskrnl.exe ).
( sigcheck is part of Sysinternals Suite.)
IT professionals managing hypervisors like Hyper-V, Proxmox, or VirtualBox rely on backend detection utilities (such as osinfo-detect in Linux environments). These utilities read the internal volume ID. If the x64fre string is missing or modified, deployment tools may fail to automatically recognize the operating system.
If you have ever used the Microsoft Software Download page to create a bootable USB drive or download an ISO file, you may have noticed cryptic strings like CCCOMA_X64FRE_EN-US_DV9 or J_CCSA_X64FRE appearing as your drive volume label. These strings are not randomized gibberish; they are highly structured, technical short-codes designed to fit legacy file system constraints while detailing the exact configuration of the operating system build. The Breakdown of the Media Label Naming Convention ces x64frev
The term "x64frev" is a technical shorthand used by Microsoft: : Indicates the 64-bit architecture.
: Strings like x64fre are commonly found in Windows installation media filenames (e.g., 7601.17514.101119-1850_x64fre_client_en-us_Retail_Ultimate-GRMCULXFRER_EN_DVD.iso ). If you are looking for a specific technical document or "white paper" related to a Windows x64 build, it might be an internal Microsoft release note or a deployment guide.
If you are looking for a "helpful story" because you saw this label on a USB drive or a system information report (like msinfo32.exe ), it generally means you are looking at a standard, consumer-ready version of 64-bit Windows. This is an architecture and build identifier string
The string is a shorthand used in Microsoft's internal build naming convention: : Likely stands for Cloud Enterprise Edition : Indicates the instruction set architecture. : Stands for
CES_X64FREV (specifically CES_X64FREV_EN-US_DV5 ) refers to the official volume license installation media for Windows 7 Enterprise
You can cross-reference the build number accompanying this string on the Windows Insider Blog to see specific patch notes and known issues for your exact version. If the x64fre string is missing or modified,
: If the "v" refers to Volume, you would generally need a Volume Licensing Key (VLK) or KMS/ADBA activation through a business organization rather than a standard retail product key. Are you trying to identify a specific Windows version or troubleshoot an installation that is showing this ID?
| Segment | Meaning | Explanation | | :--- | :--- | :--- | | | Client | Identifies the OS as a Client version of Windows (as opposed to "S" for Server). | | E | Enterprise | Indicates the edition of Windows (Enterprise, Education, Professional, etc.). Here, "E" stands for Enterprise. | | S | (Likely LTSB/LTSC Channel) | In this specific context of "CES," the "S" often denotes the Long-Term Servicing Channel (LTSC) , previously known as LTSB (Long-Term Servicing Branch). | | X64 | 64-bit Architecture | Specifies that the Windows installation is for x64 (64-bit) processors. | | FRE | Free Build | Indicates this is a retail/free build (non-debug) version of the OS. The alternative would be "CHK" for a checked/debug build. | | V | Volume License | Confirms this is a Volume License edition, designed for businesses and enterprises managing multiple systems. |
Right-click the virtual drive labeled with the build string. Select from the context menu. Method 2: Clearing an External USB Drive