The operating system returned error 21 (The device is not ready.)

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sql-server sql-server-2016 errors windows-10

                          Every time I reboot Windows, for some databases I get this error:

> The operating system returned error 21(The device is not ready.)

 1. I checked the disk with chkdsk /r - no bad sectors.
 2. I executed DBCC CHECKDB with no errors: 

        *(CHECKDB found 0 allocation errors and 0 consistency errors in database)* 
 3. If I restart SQL Server the errors disappear.

Windows 10 and SQL Server 2016 Express.

Asked by Max (491 rep)

Mar 1, 2017, 10:15 AM
Last activity: Apr 17, 2025, 09:10 AM

The operating system returned error 21 (The device is not ready.)

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