Mike,
Challenge met NRZI Non Return to Zero...... Here are some links hehe
http://www.mkp.com/books_catalog/cn/book/node27.htm
http://www.optimized.com/COMPENDI/FE-NRZI.htm
At 06:37 PM 7/27/00, you wrote:
>MFM is Modified Frequency Modulation
>RLL is Run Length Limited
>
>They are descriptions of how the bias current is manipulated to encode
>the 0's and 1's on the physical media. You were *SUPPOSED* to use MFM
>controllers with MFM drives and RLL controllers *ONLY* with RLL
>certified drives, but a lot of people pushed it because using a 20MB MFM
>drive with an RLL controller got you 30MB of storage. Sort of the same
>crowd who would be overclocking today. (What are you looking at?! You
>don't think *I* pushed the envelope back then do you?)
>
>If you want a real education about how drives work (even today) track
>and learn what NRZI means? (Hint:This is a challenge.)
>
>
>
> >Hey, speaking of the ORIGINAL topic here.... anyone remember MFM hard
> >drives??? I am subscribed to a list from Hitechcafe.com and this
>
>[...]
> >*shudder* I remember MFM hard drives. Boy those were the days... had
> >to be sure you had an RLL hard drive with the MFM controller... or
> >was it an MFM hard drive with an RLL controller??? I recall that you
> >could essentially increase your drive space by about 50% by using RLL
> >with MFM controller or vice versa... :-)
>
