I tested it too and same problem, really don't understand. Here's link to archive on my web (you can share, it stays there): www.mirkosoft.sk/cpm.rar
You find there also blank disks for CP/M80 2.2 (this system supports not D81 'cause at release 1581 existed not), for CP/M80 3.0 (D81 too). Also CP/M 2.2 reader utility for Windows which allows simple but very limited manipulation with CP/M 2.2 disks - officially program supports only D64, but works with D71 too. Operating systems: CP/M80 2.2, CP/M80 3.0, CP/M80 2.2 for ZX Spectrum, CP/M86 1.1, CP/M65 Few games and little demo, programming languages, utilities (SOFT80 is program which uses 80 column manager in CP/M80 2.2 - useful for C64 or mode 64). CPMXTRA image is for copying files from CBM filesystem to CP/M filesystem, MFM Scanner for C128 which handles CP/M disks. Also is there D2M image for FD-2000 or FD-4000 with all three Commodore CP/M versions: 80 v2.2, 80 v3.0, 65 v1c* in partitions + CBM FS partition with README.
*note: CP/Mxx = xx means CPU family: 80 = Z80 or 8080 / 86 = x86 / 65 = 65xx / 68 = MC-680x0
Create copies of blank D81 images for future use. So, if it helps, I'm happy. Miro
Commodore 64 was great, Commodore 128 is bigger, better, faster and more powerful... Commodore 65 was almost here, but C256 is coming and it will be earthquake...