Rereading the MSDN: Q161338 document I refered to before, Cygwin will need to use a minimum 128KB buffer when 'reading' data from tapes - the NT specification doesn't allow access to the 'last bytes' in a variable-block any other way. 128KB allows for any SCSI device under windows.
(I noticed there was a memcpy for each ReadFile call - so I assume CygWin uses its own internal buffers, which may or maynot be large enough for tape support.)
Jason.
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