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FVE_E_KEY_LENGTH_NOT_SUPPORTED_BY_EDRIVE
Why this is not a generic disk error
The practical meaning of FVE_E_KEY_LENGTH_NOT_SUPPORTED_BY_EDRIVE is that the self-encrypting drive cannot use the authentication key length required by BitLocker for hardware encryption. The HRESULT is 0x803100A7.
Three decisions before remediation
- Is the result target correct?
- Use the volume or protector GUID and confirm its role; do not rely only on a drive letter or friendly name.
- Is the result request allowed?
- Resolve effective policy, Windows edition, caller token and management source for the hardware-encrypted drive negotiation operation.
- Is the result state stable?
- Record conversion, protection, lock and reboot status before modifying anything.
Hardware-encrypted drives add firmware, storage-driver and drive-security state below the normal BitLocker volume provider. BitLocker can reject the hardware path before conversion starts, and policy may or may not permit a fallback to software encryption. If policy permits software fallback, verify the final method explicitly. A failed hardware dry run can otherwise leave an administrator assuming protection that never started.
Why a common workaround is wrong
This should not be diagnosed as a missing eDrive capability or policy disallowing hardware encryption; the drive was considered but key parameters are incompatible. That nearby condition needs a different corrective action and may produce a similar user-facing message.
Confirm the returning layer
- Record drive model/firmware, hardware-encryption status, supported key sizes, storage driver, policy algorithm and dry-run result.
manage-bde -status
powershell -NoProfile -Command "Get-CimInstance -Namespace root/cimv2/security/MicrosoftVolumeEncryption -Class Win32_EncryptableVolume"State checks specific to FVE_E_KEY_LENGTH_NOT_SUPPORTED_BY_EDRIVE
| Stage | How to interpret it |
|---|---|
| Before the call | Record the target identity and the pre-call hardware-encrypted drive negotiation state. The self-encrypting drive cannot use the authentication key length required by BitLocker for hardware encryption. |
| At failure | Preserve drive model/firmware, hardware-encryption status, supported key sizes, storage driver, policy algorithm and dry-run result. |
| After correction | Update supported firmware or use BitLocker software encryption; do not weaken key requirements to fit the device. |
References
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