RetroSpector78
Experienced Member
I have a MICROSCIENCE: HH-725 20MB MFM hard drive and according to the docs it has 32 sectors / track.
Going by the following assumptions (hoping they are correct)
So 2 questions :
Thx
Going by the following assumptions (hoping they are correct)
- Not the hard drive itself but rather the hard drive controller will dictate the number of sectors / track used (17 in case of MFM, 26 in case of RLL).
- The number of sectors / track will dictate how much space will become available (total disk space = cylinders * heads * sectors * 512 bytes). RLL encoding on an MFM drive results in 50% more disk space as the advertised MFM space.
- Some RLL controllers allow you to specify the number of sectors / track, allowing you to operate RLL drives on 17 sectors / track instead of 26. This would reduce their disk space by 50% but still use the higher bit rate RLL encoding.
- The higher bitrate of RLL encoding will make them faster than MFM encoded hard drives (?)
So 2 questions :
- The HH-725 hard drive mentioned above supports 32 sectors / track. Does this automatically make it eligible for RLL encoding ? If not, what is the point of having 32 sectors / track on this drive if it will only use 17 in case of MFM.
- And a side-question : Why would somebody opt to only use 17 sectors / track on an RLL hard drive (some RLL controllers allow you to configure this). I guess this would result in 50% less disk space as advertised.
Thx