On Tue, Oct 16, 2018 at 12:57 PM Paul Winalski <paul.winalski@gmail.com>
wrote:

> The block size is almost certainly 512 bytes.
>
Which is what I said - the block siize is set by the HW.
But ... the issue is trying to get the TK-50 to stream.  Hence the
traditional unix: dd ibs=64K obs=XXX | tar xvfp -  trick.

This will tell the driver to read upto 128 blocks in one DMA and then pump
the bits into tar a 'XXX block' at a time (which is is usually 20b for
tar/cpio/dump et al and Ultrix obey's).
ᐧ