At 17:15 6/01/98 -0500, PG Manney wrote:
>> > MFM (early 80's?)
>>
>> Very early 80's, I think, for the ST-506.
>>
>> > RLL (late 80's?)
>>
>> I tend to think of this as a minor variation of MFM, myself :-)
>
>Not quite. The interface is the same (ST-506/412), but the encoding is
>different.
>
>RLL-encoded ST-506/412 drives were finicky, especially as regards
>temperature -- you shouldn't LLF them cold, for example.
The problem, however, as I understand it, wasn't the ST-506/412 interface
itself, it was the fact that most of the drives that used this interface
used stepper motors to move the R/W heads. The high-end voice-coil drives
that used the
ST-506/412 interface were *far* more reliable, and usually didn't have any
problems using RLL encoding.
Regards,
| Scott McLauchlan |"Sometimes the need to mess with their heads|
|Information Services Division| outweighs the millstone of humiliation." |
| University of Canberra |__________Fox_Mulder_"The_X-Files:_Squeeze"_|
| scott_at_isd.canberra.edu.au |
http://www.canberra.edu.au/~scott/home.html |
Received on Wed Jan 07 1998 - 21:29:07 GMT