VC Language - Accessing Tape Devices using large block sizes

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Accessing Tape Devices using large block sizes

John Hennig

2005-06-11, 3:59 pm

I am trying to read data from a tape using the ReadFile utility with a
HANDLE that was acquired using the CreateFile function. If I attempt to
read a tape with small tape blocks (64K or less) everything works correctly.
As I read tapes with larger tape blocks (64K to 1M) while increasing the
registry setting for 'MaximumSGList' to accommodate the larger block size,
everything works correctly. If I have a tape with 1M+ of data in a single
tape block, the ReadFile routine returns an error that states that "More
data is available', but since the 'MaximumSGList' is at its maximum limit
(0xFF), I can not retrieve the data. How can this be done using the
ReadFile function?

Thanks

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