Tests with Tandy 6000, Type 4 Controller, 1MB RAM, Xenix 3.2

Set IL is the interleave I specify in the .cfg file and the same number I provide the diskutil format utility.
Time is the time in seconds it takes to format 5 cylinders of a 1024 cy/8 hd dsk
Log IL is the interleave I see being used in the DREM log file

Set IL		Time (5 cyl)	Drem IL
1			38.2			1
2			27.6			9
3			17.3			6
4			49.8			13
5			40.78 			7
6			29.76			3
7			19.40			5
8			31.53			15
9			43.16			2
10			32.4			12
11			22.82			14
12			34.5			10
13			45.7			4
14			34.9			11
15			25.5			8
16			33.7			16


Drem IL 6 is proving to be unreliable.  Formats will stall at track 7.

Drem IL 5 provides the best performance/reliability so far.