Re: FDD speed and capacity

["Bryan Parkoff" <BParkoff@satx.rr.com>]

    It has nothing to do with the CPU to manipulate disk drive for the
speed.  It is only hardware that is built in disk controller card to
manipulate the head, arm and the motor stepper.
    GCR and MFM formats often have the same timing speeds.  If you refer
fast transfer, it has to do with the interleaves.  For example, 1:1
interleave is probably slow because it has to read from sector to sector
sequence.  If we are going to use 2:1 and/or 4:1, it will benefit great
performance.
    If Apple IIgs is running at 2.8MHz and higher, it always reduces to 1
MHz automatically while access to read/write to slot 6 only.  3.5 drives
might be the same?

--
Yours Truly,

Bryan Parkoff
BParkoff@satx.rr.com
"Allen Bong" <sfbong@tm.net.my> wrote in message
news:3cdc94fb$1_2@news.tm.net.my...
> Something had bugged me for a long time about what are the factors that
> control the speed of transferring a file to a FDD and the capacity of the
> floppy disk drive in DOS, ProDos and GS/OS.
>
> If Apple II was designed with a faster cpu, would it end up with a DOS
> system that transfers a large file to the FDD faster or a disk with a
higher
> capacity?  As the file was written to FDD using the RWTS subroutine which
> uses software timing, does it determine the transfer rate?  What did
> Pronto-DOS and Derversi DOS do to make the transfer faster?
>
> Which has the faster transfer speed ?   An Apple IIgs (2.8MHz) with 3.5"
> 800K using GCR format disk or a 720K DSDD using MFM format running on a
PIII
> 1GHz windoz machine?
>
> If the 6502B was selling at $10 in 1976, Would Woz come out with a DOS
that
> runs faster or a bigger capacity disk drive?
>
> Allen.
>
>
>
>