Hardware / KryoFlux / BASF CE-Diskette

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Playing with the KryoFlux

Once you start playing with the KryoFlux, you don't want to stop. Of course, you can copy disks with the KryoFlux, but that is actually boring. It is much more fun to explore special disks. And there the so called alignment disks „come into play“.

KryoFlux
KryoFlux with Mitsubishi M4854-342

My floppy disk drives for testing are:

BASF CE-Diskette

A few months ago I bought a brand new (NOS) BASF CE-Diskette for floppy disk drive alignment.

You can use this alignment disk for single and double sided 5.25 inch disk drives in 48 tpi and 96 tpi format. Ingenious! What more could you want.

BASF 1 CE-Diskette
BASF CE-Diskette
BASF 1 CE-Diskette
BASF CE-Diskette

48 tpi

The alignment patterns are prerecorded as follows:

KryoFlux graphs für 48 tpi
KryoFlux graphs for 48 tpi

In addition to the above-mentioned tracks 00, 14, 20 and 34, you can also recognise clear patterns on track 23. These are probably the patterns for the 96 tpi drive at track 44 or 45! You remember, the R/W head of a 48 tpi drive is almost twice as wide as a 96 tpi R/W head. One step on a 48 tpi drive is equivalent to a double step on a 96 tpi drive.

If you compare the 48 tpi tracks with the 96 tpi tracks, you will see this; track 34/68 and track 20/40!

96 tpi

The alignment patterns are prerecorded as follows:

KryoFlux graphs für 96 tpi
KryoFlux graphs for 96 tpi

Track 00 - side 0 - Index alignment

Track 00 - side 0 - Index alignment
Track 00 - side 0 - Index alignment

Track 40 - side 0 - Track adjustment

Track 40 - side 0 - Track adjustment
Track 40 - side 0 - Track adjustment

Track 45 - side 0 - Azimuth control 31'

This pattern and the following one are special in that they have regular unformatted areas (pink colour). Have a look at the KryoFlux manual, page 31 onwards, „Example graphs“. Some copy protection mechanisms also use unformatted areas within a track.

Track 45 - side 0 - Azimuth control 31'
Track 45 - side 0 - Azimuth control 31'

Track 48 - side 0 - Azimuth control 0'

As a non-expert, I cannot see the difference to the previous pattern.

Track 48 - side 0 - Azimuth control 0'
Track 48 - side 0 - Azimuth control 0'

A comparison of track 20/48 tpi and track 40/96 tpi

KryoFlux graphs für 96 tpi
20-0/48 ----- 40-0/96
20-1/48 ----- 40-1/96

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