which is exactly what i suggested - writing 0 byte disc

that writes binary 0, the ASCII "NUL" character. /dev/zero is NOT a zero-size file.

yes it is

[woj...@wojtek ~/NOBACKUP]$ dd if=/dev/null of=/dev/null bs=1
0+0 records in
0+0 records out
0 bytes transferred in 0.000037 secs (0 bytes/sec)

/dev/null simply gives EOF when trying to read
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