ERROR_EFS_ALG_BLOB_TOO_BIG 0x8007177D

Error code 6013 · HRESULT 0x8007177D

WINDOWS

The encryption algorithm used on the source file needs a bigger key buffer than the one on the destination file.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

ERROR_EFS_ALG_BLOB_TOO_BIG is a Windows error code (system error 6013, returned as HRESULT 0x8007177D) reported by Windows. Its official message is: “The encryption algorithm used on the source file needs a bigger key buffer than the one on the destination file.”

How to fix ERROR_EFS_ALG_BLOB_TOO_BIG

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

ERROR_EFS_DISABLEDERROR_EFS_SERVER_NOT_TRUSTEDERROR_EFS_VERSION_NOT_SUPPORTERROR_EFS_NOT_ALLOWED_IN_TRANSACTIONERROR_BAD_RECOVERY_POLICYERROR_VOLUME_NOT_SUPPORT_EFSERROR_DIR_EFS_DISALLOWED

Source: Microsoft WinError.h

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