How can I update or Append a binary file?

I want to append or Update a binary file into a disk. As I'm using a put statement to  to write bninary data into a file. From an array
I want to update the file each time I write binary data into a file without deleting the previous one.
 I don't want use get statement first to read data thenupdated together.
as the array data is too big.
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deightonConnect With a Mentor Commented:
Find out the size of the file using the Lof command ( Lof(1) for example)  and hence how many records there are and then position to the end of the file by using

 put #1,records+1,x
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