24-07-2020, 11:01 AM
Hi hippietrail and welcome to the forum 
The Microbee's came with 3 basic disk formats, the 5.25" 40 tr were double sided double density, then the first 3.5" was 80 tr single sided, then when the Premium came it went to 80tr double sided. There were few 3rd party formats (Dreamdisk, Beeboard, Peter Broughton, etc) and the very earliest 5.25" disks could also be formatted as Single Density single or double sided, only ever seen 2 of those in the wild.
If you have any questions, just ask
The Microbee's came with 3 basic disk formats, the 5.25" 40 tr were double sided double density, then the first 3.5" was 80 tr single sided, then when the Premium came it went to 80tr double sided. There were few 3rd party formats (Dreamdisk, Beeboard, Peter Broughton, etc) and the very earliest 5.25" disks could also be formatted as Single Density single or double sided, only ever seen 2 of those in the wild.
If you have any questions, just ask
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ChickenMan
ChickenMan