ERROR_VOLUME_NOT_SIS_ENABLED - 4500 (0x1194)
Single Instance Storage is not available on this volume.
Updated: Feb 21, 2026
Technical Meaning
The error code ERROR_VOLUME_NOT_SIS_ENABLED with the numeric value 4500 (0x1194) indicates that Single Instance Storage (SIS) is not available on the specified volume. SIS is a feature in Windows designed to reduce storage space by eliminating duplicate files.
Error Details
This error typically occurs when an operation requires SIS, but it is not enabled or supported on the target volume. The error message provides context that SIS is not available, which can be relevant for operations such as file copying, moving, or creating hard links.
Usage Context
SIS is a feature of the Windows file system and is typically associated with volumes formatted using NTFS (New Technology File System). This error may appear in scenarios where an application or system operation attempts to utilize SIS capabilities but encounters this limitation.
Developer Interpretation
Developers should interpret this error as indicating that the requested operation cannot proceed due to a lack of support for Single Instance Storage on the specified volume. This could be relevant for operations such as file duplication, hard link creation, or other actions that rely on SIS functionality.
Related Errors
ERROR_FILE_NOT_SIS_ENABLED(4501)ERROR_VOLUME_IS_COMPRESSED(289)ERROR_NOT_A_REPARSE_POINT(3627)
These errors may provide additional context or related issues that could affect the availability of SIS on a volume.
FAQ
Q: What does this error mean?
A: The error indicates that Single Instance Storage is not available on the specified volume, preventing certain file operations from proceeding as expected.
Q: How can I resolve this issue?
A: Ensure that SIS is enabled and supported on the target volume. Check the volume properties or consult system documentation for specific requirements.
Summary
The ERROR_VOLUME_NOT_SIS_ENABLED error (4500) signifies that Single Instance Storage is not available on a specified NTFS volume, preventing certain file operations from completing successfully. Developers should handle this error by ensuring SIS support and adjusting operation contexts accordingly.