[Coco] Orchestra 90 playing the disk blues

[Barry Nelson]

According to the Orchestra 90 documentation:

DIR :number
Display the diskette's directory. 
Set up Orchestra-90 CC to run with a disk system.

If you have a disk system, you can verify the directory's contents by
typing D, a space, a colon, and the drive number, followed by
[ENTER]. This command displays the names of only the Orchestra-90
CC music files on the diskette. It also sets up the system for using dis-
kettles rather than cassette tapes. For example, to check Drive 1's direc-
tory, type:

    D :1 [ENTER]

The directory for that diskette then appears on the screen.
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I am having a lot of issues getting this to work, I keep getting error 7. Any suggestions?