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sql server error 21 the device is not ready

SQL Server Error 21 – The operating system returned error 21(The device is not ready)

Error Description:

The operating system returned error 21(The device is not ready) Databases not accessible after restart.  The following error is popped up every time restart Windows operating system is done :

Error 21 was returned by the operating system.(The device is not yet operational.) or
sql server drop database error 21 or
the operating system returned error 21(failed to retrieve text for this error. reason: 15105) or
sql server error: 21, encryption not supported on the client

you will see that running chkdsk /r on the disc and found no bad sectors.
DBCC CHECKDB and you will not found errors.

DBCC CHECKDB discovered 0 allocation and 0 consistency errors in the database

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