Change a table column from nvarchar to varbinary(max)

I am writing a query to change the datatype of the sql table column from navarchar to varbinary(max).
The query i am referring is to :

   ALTER COLUMN DrIgLoc varbinary(max)

But, I get this error :
Implicit conversion from data type nvarchar to varbinary(max) is not allowed. Use the CONVERT function to run this query.

Any suggestions  without recresting the table as this is live.

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Pawan KumarDatabase ExpertCommented:
You have to

Alter table and add a new column of type VARBINARY(MAX)

then use the update statement to move data from that column to the new column.

after that drop the old column.
Daniel_PLDB Expert/ArchitectCommented:

How fast you can do it depends on how big and how structured is your table.

USE yourDBname

ALTER TABLE  [dbo].[Fie]
ADD [DrIgLocBin]  varbinary(max) 

UPDATE [dbo].[Fie] SET DrIgLocBin = CAST(DrIgLoc as VARBINARY)

--You may break app here!

ALTER TABLE  [dbo].[Fie]

EXEC sp_rename 'dbo.Fie.DrIgLocBin ', 'DrIgLoc', 'COLUMN';

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RIASAuthor Commented:
Cheers! Worked like charm!
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