Using SQL Server with BitLocker - The operating system returned error 21 (The device is not ready.) to SQL Server during a read at offset….




When using Microsoft SQL Server on a computer protected by BitLocker you may see the error

The operating system returned error 21 (The device is not ready.) to SQL Server during a read at offset….




This error can be caused because BitLocker auto-unlocks the drive after SQL Server has already started.


You can either set the service to manual and start it after login (manually or with a login script) or try using the Automatic (Delayed Start) startup type on the SQL service.






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