4 Nov
2010
4 Nov
'10
3:33 p.m.
On 4 Nov 2010 at 15:04, Fred Cisin wrote:
Thanks. I got sloppy. This is one situation where I
should have said
"MFM", or clarified the comparison as "ST412 MFM", since I was
trying
to say that the RLL drives were cabled the same, but the data transfer
rates and encoding may be different.
...and "MFM" as interpreted on an ST412-interface drive can vary
wildly between manufacturers (with respect to ID mark conventions,
CRC/ECC polynomials, etc.).
And then there was "ARLL" that was something like (3,11) (although I
don't remember exactly). Used mostly by Perstor controllers.
I'd be mildly surprised if some enterprising firm didn't try to
record a frame of analog video at 60 fps on an ST412 track. One rev
per frame...
Also, some ESDI drives used hard sectoring.
--Chuck