22 Feb
2022
22 Feb
'22
8:40 p.m.
On 2/22/22 19:43, Jay Jaeger via cctalk wrote:
Writing a 360KB or RX50 diskette with a 1.2MB drive is
a path to a lot
of frustration.? Not only do you have to double step the drive (software
often takes care of that part), but the tracks written will be narrower
than a real RX50 / 306KB drive, providing a smaller signal/noise ratio.
?And, if you don't start with completely magnetically erased media, any
left over junk in any data left over may be picked up by the RX50 head.
The RX50 format is a single-sided 96 tpi one, vix:
The format used on a RX50 disk is:
single sided
80 tracks
10 sectors per track
96 tpi (tracks per inch)
300 rpm (revolutions per minute)
250 KHz data rate
This is very different from the PC 360K format, which is
double-sided
40 tracks
9 sectors per track
48 tpi
300 rpm
250 Khz data rate.
A "1.2M" disk drive normally spins at 360 RPM, so you have to set the
data rate at 300 Khz.
--Chuck